diff --git a/std/assembly/date.ts b/std/assembly/date.ts
index 53d83c4476..230f995c6d 100644
--- a/std/assembly/date.ts
+++ b/std/assembly/date.ts
@@ -168,10 +168,10 @@ export class Date {
     this.setTime(i64(daysSinceEpoch(this.year, this.month, day)) * MILLIS_PER_DAY + ms);
   }
 
-  setUTCMonth(month: i32): void {
-    if (this.month == month) return;
+  setUTCMonth(month: i32, day: i32 = this.day): void {
+    if (this.month == month + 1) return;
     var ms = euclidRem(this.epochMillis, MILLIS_PER_DAY);
-    this.setTime(i64(daysSinceEpoch(this.year, month + 1, this.day)) * MILLIS_PER_DAY + ms);
+    this.setTime(i64(daysSinceEpoch(this.year, month + 1, day)) * MILLIS_PER_DAY + ms);
   }
 
   setUTCFullYear(year: i32): void {
diff --git a/std/assembly/index.d.ts b/std/assembly/index.d.ts
index d51ebf5c91..7a6cc9e7e5 100644
--- a/std/assembly/index.d.ts
+++ b/std/assembly/index.d.ts
@@ -1887,7 +1887,7 @@ declare class Date {
   getUTCMilliseconds(): i32;
 
   setUTCFullYear(value: i32): void;
-  setUTCMonth(value: i32): void;
+  setUTCMonth(value: i32, day?: i32): void;
   setUTCDate(value: i32): void;
   setUTCHours(value: i32): void;
   setUTCMinutes(value: i32): void;
diff --git a/tests/compiler/std/date.debug.wat b/tests/compiler/std/date.debug.wat
index 2eaa891b49..59f9c2984d 100644
--- a/tests/compiler/std/date.debug.wat
+++ b/tests/compiler/std/date.debug.wat
@@ -35,6 +35,7 @@
  (global $~lib/rt/itcms/fromSpace (mut i32) (i32.const 0))
  (global $~lib/rt/tlsf/ROOT (mut i32) (i32.const 0))
  (global $~lib/native/ASC_LOW_MEMORY_LIMIT i32 (i32.const 0))
+ (global $~argumentsLength (mut i32) (i32.const 0))
  (global $~lib/native/ASC_SHRINK_LEVEL i32 (i32.const 0))
  (global $~lib/builtins/i32.MAX_VALUE i32 (i32.const 2147483647))
  (global $~lib/native/ASC_RUNTIME i32 (i32.const 2))
@@ -2742,57 +2743,78 @@
   call $~lib/date/Date#setTime
   drop
  )
- (func $~lib/date/Date#setUTCMonth (param $0 i32) (param $1 i32)
-  (local $2 i64)
+ (func $~lib/date/Date#setUTCMonth (param $0 i32) (param $1 i32) (param $2 i32)
   (local $3 i64)
   (local $4 i64)
   (local $5 i64)
+  (local $6 i64)
   local.get $0
   i32.load offset=4
   local.get $1
+  i32.const 1
+  i32.add
   i32.eq
   if
    return
   end
   local.get $0
   i64.load offset=16
-  local.set $3
+  local.set $4
   i32.const 86400000
   i64.extend_i32_s
-  local.set $2
+  local.set $3
+  local.get $4
   local.get $3
-  local.get $2
   i64.rem_s
-  local.set $4
-  local.get $4
-  local.get $4
+  local.set $5
+  local.get $5
+  local.get $5
   i64.const 0
   i64.lt_s
   if (result i64)
-   local.get $2
+   local.get $3
   else
    i64.const 0
   end
   i64.add
-  local.set $5
+  local.set $6
   local.get $0
   local.get $0
   i32.load
   local.get $1
   i32.const 1
   i32.add
-  local.get $0
-  i32.load offset=8
+  local.get $2
   call $~lib/date/daysSinceEpoch
   i64.extend_i32_s
   i32.const 86400000
   i64.extend_i32_s
   i64.mul
-  local.get $5
+  local.get $6
   i64.add
   call $~lib/date/Date#setTime
   drop
  )
+ (func $~lib/date/Date#setUTCMonth@varargs (param $0 i32) (param $1 i32) (param $2 i32)
+  block $1of1
+   block $0of1
+    block $outOfRange
+     global.get $~argumentsLength
+     i32.const 1
+     i32.sub
+     br_table $0of1 $1of1 $outOfRange
+    end
+    unreachable
+   end
+   local.get $0
+   i32.load offset=8
+   local.set $2
+  end
+  local.get $0
+  local.get $1
+  local.get $2
+  call $~lib/date/Date#setUTCMonth
+ )
  (func $~lib/date/Date#setUTCFullYear (param $0 i32) (param $1 i32)
   (local $2 i64)
   (local $3 i64)
@@ -7258,8 +7280,11 @@
   i32.const 30
   call $~lib/date/Date#setUTCDate
   local.get $1
+  i32.const 0
   i32.const 1
-  call $~lib/date/Date#setUTCMonth
+  global.set $~argumentsLength
+  i32.const 0
+  call $~lib/date/Date#setUTCMonth@varargs
   local.get $1
   i32.const 1
   call $~lib/date/Date#setUTCDate
@@ -7270,8 +7295,28 @@
   i32.const 2024
   call $~lib/date/Date#setUTCFullYear
   local.get $1
+  i32.const 1
+  i32.const 1
+  global.set $~argumentsLength
+  i32.const 0
+  call $~lib/date/Date#setUTCMonth@varargs
+  local.get $1
+  local.set $3
+  local.get $3
+  i32.load offset=4
+  i32.const 1
+  i32.sub
   i32.const 2
-  call $~lib/date/Date#setUTCMonth
+  i32.eq
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 128
+   i32.const 141
+   i32.const 3
+   call $~lib/builtins/abort
+   unreachable
+  end
   local.get $1
   i32.const 1
   call $~lib/date/Date#setUTCDate
@@ -7279,23 +7324,46 @@
   i32.const 29
   call $~lib/date/Date#setUTCDate
   local.get $1
-  local.set $3
-  local.get $3
+  i32.const 1
+  i32.const 1
+  global.set $~argumentsLength
+  i32.const 0
+  call $~lib/date/Date#setUTCMonth@varargs
+  local.get $1
+  local.set $2
+  local.get $2
   i64.load offset=16
-  i64.const 1711674191274
+  i64.const 1709168591274
   i64.eq
   i32.eqz
   if
    i32.const 0
    i32.const 128
-   i32.const 144
+   i32.const 146
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
   local.get $1
-  local.set $2
-  local.get $2
+  local.set $0
+  local.get $0
+  i32.load offset=4
+  i32.const 1
+  i32.sub
+  i32.const 1
+  i32.eq
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 128
+   i32.const 147
+   i32.const 3
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  local.set $6
+  local.get $6
   i32.load offset=8
   i32.const 29
   i32.eq
@@ -7303,7 +7371,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 145
+   i32.const 148
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7316,7 +7384,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 146
+   i32.const 149
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7329,7 +7397,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 147
+   i32.const 150
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7342,7 +7410,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 148
+   i32.const 151
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7357,8 +7425,8 @@
   i32.const 20
   call $~lib/date/Date#setUTCDate
   local.get $1
-  local.set $0
-  local.get $0
+  local.set $5
+  local.get $5
   i64.load offset=16
   i64.const 1363748399999
   i64.eq
@@ -7366,7 +7434,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 152
+   i32.const 155
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7375,8 +7443,8 @@
   i32.const 1
   call $~lib/date/Date#setUTCDate
   local.get $1
-  local.set $6
-  local.get $6
+  local.set $4
+  local.get $4
   i64.load offset=16
   i64.const 1362106799999
   i64.eq
@@ -7384,7 +7452,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 154
+   i32.const 157
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7393,8 +7461,8 @@
   i32.const 1000
   call $~lib/date/Date#setUTCMilliseconds
   local.get $1
-  local.set $5
-  local.get $5
+  local.set $3
+  local.get $3
   i64.load offset=16
   i64.const 1362106800000
   i64.eq
@@ -7402,7 +7470,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 157
+   i32.const 160
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7415,8 +7483,8 @@
   i32.mul
   call $~lib/date/Date#setUTCMilliseconds
   local.get $1
-  local.set $4
-  local.get $4
+  local.set $2
+  local.get $2
   i64.load offset=16
   i64.const 1362110400000
   i64.eq
@@ -7424,7 +7492,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 160
+   i32.const 163
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7439,8 +7507,8 @@
   i32.add
   call $~lib/date/Date#setUTCMilliseconds
   local.get $1
-  local.set $3
-  local.get $3
+  local.set $0
+  local.get $0
   i64.load offset=16
   i64.const 1362114000001
   i64.eq
@@ -7448,7 +7516,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 163
+   i32.const 166
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7463,8 +7531,8 @@
   i32.add
   call $~lib/date/Date#setUTCMilliseconds
   local.get $1
-  local.set $2
-  local.get $2
+  local.set $6
+  local.get $6
   i64.load offset=16
   i64.const 1362117600001
   i64.eq
@@ -7472,7 +7540,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 166
+   i32.const 169
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7487,8 +7555,8 @@
   i32.const -2208
   call $~lib/date/Date#setUTCDate
   local.get $1
-  local.set $0
-  local.get $0
+  local.set $5
+  local.get $5
   i64.load offset=16
   i64.const -67301808726
   i64.eq
@@ -7496,7 +7564,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 170
+   i32.const 173
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7511,8 +7579,8 @@
   i32.const 2208
   call $~lib/date/Date#setUTCDate
   local.get $1
-  local.set $6
-  local.get $6
+  local.set $4
+  local.get $4
   i64.load offset=16
   i64.const 314240591274
   i64.eq
@@ -7520,7 +7588,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 174
+   i32.const 177
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7529,13 +7597,13 @@
   i32.const 0
   i64.const 1467763200000
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   i32.load
-  local.get $5
+  local.get $3
   i32.load offset=4
-  local.get $5
+  local.get $3
   i32.load offset=8
   call $~lib/date/dayOfWeek
   i32.const 3
@@ -7544,7 +7612,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 184
+   i32.const 187
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7555,13 +7623,13 @@
   i64.const 1
   i64.sub
   call $~lib/date/Date#constructor
-  local.tee $4
+  local.tee $2
   i32.store offset=8
-  local.get $4
+  local.get $2
   i32.load
-  local.get $4
+  local.get $2
   i32.load offset=4
-  local.get $4
+  local.get $2
   i32.load offset=8
   call $~lib/date/dayOfWeek
   i32.const 2
@@ -7570,7 +7638,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 185
+   i32.const 188
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7583,13 +7651,13 @@
   i64.const 1
   i64.sub
   call $~lib/date/Date#constructor
-  local.tee $3
+  local.tee $0
   i32.store offset=12
-  local.get $3
+  local.get $0
   i32.load
-  local.get $3
+  local.get $0
   i32.load offset=4
-  local.get $3
+  local.get $0
   i32.load offset=8
   call $~lib/date/dayOfWeek
   i32.const 3
@@ -7598,7 +7666,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 186
+   i32.const 189
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7609,13 +7677,13 @@
   i64.const 86400000
   i64.add
   call $~lib/date/Date#constructor
-  local.tee $2
+  local.tee $6
   i32.store offset=16
-  local.get $2
+  local.get $6
   i32.load
-  local.get $2
+  local.get $6
   i32.load offset=4
-  local.get $2
+  local.get $6
   i32.load offset=8
   call $~lib/date/dayOfWeek
   i32.const 4
@@ -7624,7 +7692,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 187
+   i32.const 190
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7633,13 +7701,13 @@
   i32.const 0
   i64.const 1468022400000
   call $~lib/date/Date#constructor
-  local.tee $0
+  local.tee $5
   i32.store offset=20
-  local.get $0
+  local.get $5
   i32.load
-  local.get $0
+  local.get $5
   i32.load offset=4
-  local.get $0
+  local.get $5
   i32.load offset=8
   call $~lib/date/dayOfWeek
   i32.const 6
@@ -7648,7 +7716,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 189
+   i32.const 192
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7659,13 +7727,13 @@
   i64.const 1
   i64.sub
   call $~lib/date/Date#constructor
-  local.tee $6
+  local.tee $4
   i32.store offset=24
-  local.get $6
+  local.get $4
   i32.load
-  local.get $6
+  local.get $4
   i32.load offset=4
-  local.get $6
+  local.get $4
   i32.load offset=8
   call $~lib/date/dayOfWeek
   i32.const 5
@@ -7674,7 +7742,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 190
+   i32.const 193
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7702,7 +7770,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 191
+   i32.const 194
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7713,13 +7781,13 @@
   i64.const 86400000
   i64.add
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   i32.load
-  local.get $5
+  local.get $3
   i32.load offset=4
-  local.get $5
+  local.get $3
   i32.load offset=8
   call $~lib/date/dayOfWeek
   i32.const 0
@@ -7728,7 +7796,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 192
+   i32.const 195
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7737,11 +7805,11 @@
   i32.const 0
   i64.const 7899943856218720
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $4
-  local.get $4
+  local.get $3
+  local.set $2
+  local.get $2
   i32.load offset=4
   i32.const 1
   i32.sub
@@ -7751,17 +7819,20 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 198
+   i32.const 201
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $5
+  local.get $3
   i32.const 10
-  call $~lib/date/Date#setUTCMonth
-  local.get $5
-  local.set $3
+  i32.const 1
+  global.set $~argumentsLength
+  i32.const 0
+  call $~lib/date/Date#setUTCMonth@varargs
   local.get $3
+  local.set $0
+  local.get $0
   i32.load offset=4
   i32.const 1
   i32.sub
@@ -7771,17 +7842,20 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 200
+   i32.const 203
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $5
+  local.get $3
   i32.const 2
-  call $~lib/date/Date#setUTCMonth
-  local.get $5
-  local.set $2
-  local.get $2
+  i32.const 1
+  global.set $~argumentsLength
+  i32.const 0
+  call $~lib/date/Date#setUTCMonth@varargs
+  local.get $3
+  local.set $6
+  local.get $6
   i32.load offset=4
   i32.const 1
   i32.sub
@@ -7791,14 +7865,14 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 202
+   i32.const 205
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
+  local.get $3
+  local.set $5
   local.get $5
-  local.set $0
-  local.get $0
   i64.load offset=16
   i64.const 7899941177818720
   i64.eq
@@ -7806,40 +7880,43 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 203
+   i32.const 206
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $5
+  local.get $3
+  i32.const 0
   i32.const 1
-  call $~lib/date/Date#setUTCMonth
-  local.get $5
-  i32.const 12
-  call $~lib/date/Date#setUTCMonth
-  local.get $5
-  local.set $6
-  local.get $6
+  global.set $~argumentsLength
+  i32.const 0
+  call $~lib/date/Date#setUTCMonth@varargs
+  local.get $3
+  local.set $4
+  local.get $4
   i64.load offset=16
-  i64.const 7899967616218720
+  i64.const 7899936080218720
   i64.eq
   i32.eqz
   if
    i32.const 0
    i32.const 128
-   i32.const 207
+   i32.const 209
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $5
+  local.get $3
+  i32.const 11
+  i32.const 1
+  global.set $~argumentsLength
   i32.const 0
-  call $~lib/date/Date#setUTCMonth
-  local.get $5
+  call $~lib/date/Date#setUTCMonth@varargs
+  local.get $3
   local.set $1
   local.get $1
   i64.load offset=16
-  i64.const 7899967616218720
+  i64.const 7899964937818720
   i64.eq
   i32.eqz
   if
@@ -7850,20 +7927,78 @@
    call $~lib/builtins/abort
    unreachable
   end
+  local.get $3
+  i32.const -1
+  i32.const 1
+  global.set $~argumentsLength
+  i32.const 0
+  call $~lib/date/Date#setUTCMonth@varargs
+  local.get $3
+  local.set $2
+  local.get $2
+  i32.load offset=4
+  i32.const 1
+  i32.sub
+  i32.const 11
+  i32.eq
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 128
+   i32.const 215
+   i32.const 3
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $3
+  local.set $0
+  local.get $0
+  i64.load offset=16
+  i64.const 7899933401818720
+  i64.eq
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 128
+   i32.const 216
+   i32.const 3
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $3
+  i32.const 12
+  i32.const 1
+  global.set $~argumentsLength
+  i32.const 0
+  call $~lib/date/Date#setUTCMonth@varargs
+  local.get $3
+  local.set $6
+  local.get $6
+  i32.load offset=4
+  i32.const 1
+  i32.sub
+  i32.const 0
+  i32.eq
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 128
+   i32.const 218
+   i32.const 3
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $3
+  local.set $5
   local.get $5
-  i32.const 13
-  call $~lib/date/Date#setUTCMonth
-  local.get $5
-  local.set $4
-  local.get $4
   i64.load offset=16
-  i64.const 7900001830618720
+  i64.const 7899936080218720
   i64.eq
   i32.eqz
   if
    i32.const 0
    i32.const 128
-   i32.const 213
+   i32.const 219
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7872,11 +8007,11 @@
   i32.const 0
   i64.const 7941202527925698
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $3
   local.get $3
+  local.set $4
+  local.get $4
   i32.load
   i32.const 253616
   i32.eq
@@ -7884,17 +8019,17 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 219
+   i32.const 225
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $5
+  local.get $3
   i32.const 1976
   call $~lib/date/Date#setUTCFullYear
-  local.get $5
-  local.set $2
-  local.get $2
+  local.get $3
+  local.set $1
+  local.get $1
   i32.load
   i32.const 1976
   i32.eq
@@ -7902,17 +8037,17 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 221
+   i32.const 227
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $5
+  local.get $3
   i32.const 20212
   call $~lib/date/Date#setUTCFullYear
-  local.get $5
-  local.set $0
-  local.get $0
+  local.get $3
+  local.set $2
+  local.get $2
   i32.load
   i32.const 20212
   i32.eq
@@ -7920,17 +8055,17 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 223
+   i32.const 229
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $5
+  local.get $3
   i32.const 71
   call $~lib/date/Date#setUTCFullYear
-  local.get $5
-  local.set $6
-  local.get $6
+  local.get $3
+  local.set $0
+  local.get $0
   i32.load
   i32.const 71
   i32.eq
@@ -7938,7 +8073,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 225
+   i32.const 231
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7947,9 +8082,9 @@
   i32.const 0
   i64.const -62167219200000
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -7967,7 +8102,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 231
+   i32.const 237
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -7978,9 +8113,9 @@
   i64.const 1
   i64.sub
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -7998,7 +8133,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 233
+   i32.const 239
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8007,9 +8142,9 @@
   i32.const 0
   i64.const -62127219200000
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8027,7 +8162,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 235
+   i32.const 241
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8036,9 +8171,9 @@
   i32.const 0
   i64.const 1231231231020
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8056,7 +8191,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 237
+   i32.const 243
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8065,9 +8200,9 @@
   i32.const 0
   i64.const 1231231231456
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8085,7 +8220,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 239
+   i32.const 245
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8094,9 +8229,9 @@
   i32.const 0
   i64.const 322331231231020
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8114,7 +8249,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 241
+   i32.const 247
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8123,9 +8258,9 @@
   i32.const 0
   i64.const 253402300799999
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8143,7 +8278,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 243
+   i32.const 249
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8152,9 +8287,9 @@
   i32.const 0
   i64.const 253402300800000
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8172,7 +8307,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 245
+   i32.const 251
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8181,9 +8316,9 @@
   i32.const 0
   i64.const -62847038769226
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8201,7 +8336,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 247
+   i32.const 253
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8210,9 +8345,9 @@
   i32.const 0
   i64.const -61536067200000
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toDateString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8230,7 +8365,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 253
+   i32.const 259
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8239,9 +8374,9 @@
   i32.const 0
   i64.const 1580601600000
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toDateString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8259,7 +8394,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 255
+   i32.const 261
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8268,9 +8403,9 @@
   i32.const 0
   i64.const -62183116800000
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toDateString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8288,7 +8423,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 258
+   i32.const 264
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8297,9 +8432,9 @@
   i32.const 0
   i64.const -61536067200000
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toTimeString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8317,7 +8452,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 264
+   i32.const 270
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8326,9 +8461,9 @@
   i32.const 0
   i64.const 253402300799999
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toTimeString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8346,7 +8481,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 267
+   i32.const 273
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8355,9 +8490,9 @@
   i32.const 0
   i64.const -61536067200000
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toUTCString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8375,7 +8510,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 273
+   i32.const 279
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8384,9 +8519,9 @@
   i32.const 0
   i64.const 1580741613467
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toUTCString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8404,7 +8539,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 275
+   i32.const 281
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8413,9 +8548,9 @@
   i32.const 0
   i64.const -62183116800000
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toUTCString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8433,7 +8568,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 278
+   i32.const 284
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8446,11 +8581,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $1
-  local.get $1
+  local.get $3
+  local.set $6
+  local.get $6
   i64.load offset=16
   i64.const 192067200000
   i64.eq
@@ -8458,7 +8593,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 285
+   i32.const 291
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8471,11 +8606,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
+  local.get $3
+  local.set $5
   local.get $5
-  local.set $4
-  local.get $4
   i64.load offset=16
   i64.const 192067200000
   i64.eq
@@ -8483,7 +8618,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 287
+   i32.const 293
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8496,11 +8631,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $3
   local.get $3
+  local.set $4
+  local.get $4
   i64.load offset=16
   i64.const 11860387200000
   i64.eq
@@ -8508,7 +8643,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 289
+   i32.const 295
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8521,11 +8656,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $2
-  local.get $2
+  local.get $3
+  local.set $1
+  local.get $1
   i64.load offset=16
   i64.const 192112496000
   i64.eq
@@ -8533,7 +8668,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 293
+   i32.const 299
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8546,11 +8681,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $0
-  local.get $0
+  local.get $3
+  local.set $2
+  local.get $2
   i64.load offset=16
   i64.const 192112496456
   i64.eq
@@ -8558,7 +8693,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 297
+   i32.const 303
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8571,11 +8706,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $6
-  local.get $6
+  local.get $3
+  local.set $0
+  local.get $0
   i64.load offset=16
   i64.const 192112496456
   i64.eq
@@ -8583,7 +8718,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 301
+   i32.const 307
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8596,11 +8731,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $1
-  local.get $1
+  local.get $3
+  local.set $6
+  local.get $6
   i64.load offset=16
   i64.const -62167219200000
   i64.eq
@@ -8608,7 +8743,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 304
+   i32.const 310
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8621,11 +8756,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
+  local.get $3
+  local.set $5
   local.get $5
-  local.set $4
-  local.get $4
   i64.load offset=16
   i64.const -62135596800000
   i64.eq
@@ -8633,7 +8768,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 307
+   i32.const 313
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8646,11 +8781,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $3
   local.get $3
+  local.set $4
+  local.get $4
   i64.load offset=16
   i64.const 189302400000
   i64.eq
@@ -8658,7 +8793,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 310
+   i32.const 316
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8671,11 +8806,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $2
-  local.get $2
+  local.get $3
+  local.set $1
+  local.get $1
   i64.load offset=16
   i64.const 191980800000
   i64.eq
@@ -8683,7 +8818,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 313
+   i32.const 319
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8696,11 +8831,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $0
-  local.get $0
+  local.get $3
+  local.set $2
+  local.get $2
   i64.load offset=16
   i64.const 192067200000
   i64.eq
@@ -8708,7 +8843,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 316
+   i32.const 322
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8721,11 +8856,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $6
-  local.get $6
+  local.get $3
+  local.set $0
+  local.get $0
   i64.load offset=16
   i64.const 192112440000
   i64.eq
@@ -8733,7 +8868,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 319
+   i32.const 325
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8746,11 +8881,11 @@
   i32.store offset=28
   local.get $8
   call $~lib/date/Date.fromString
-  local.tee $5
+  local.tee $3
   i32.store offset=4
-  local.get $5
-  local.set $1
-  local.get $1
+  local.get $3
+  local.set $6
+  local.get $6
   i64.load offset=16
   i64.const 192112496000
   i64.eq
@@ -8758,7 +8893,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 322
+   i32.const 328
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8767,17 +8902,17 @@
   i32.const 0
   i64.const -8640000000000000
   call $~lib/date/Date#constructor
-  local.tee $5
+  local.tee $3
   i32.store offset=4
   global.get $~lib/memory/__stack_pointer
   i32.const 0
   i64.const 8640000000000000
   call $~lib/date/Date#constructor
-  local.tee $1
-  i32.store
+  local.tee $6
+  i32.store offset=16
+  local.get $3
+  local.set $5
   local.get $5
-  local.set $4
-  local.get $4
   i64.load offset=16
   i64.const -8640000000000000
   i64.eq
@@ -8785,14 +8920,14 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 340
+   i32.const 346
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $1
-  local.set $3
-  local.get $3
+  local.get $6
+  local.set $4
+  local.get $4
   i64.load offset=16
   i64.const 8640000000000000
   i64.eq
@@ -8800,14 +8935,14 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 341
+   i32.const 347
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $5
-  local.set $2
-  local.get $2
+  local.get $3
+  local.set $1
+  local.get $1
   i32.load
   i32.const -271821
   i32.eq
@@ -8815,14 +8950,14 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 343
+   i32.const 349
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $1
-  local.set $0
-  local.get $0
+  local.get $6
+  local.set $2
+  local.get $2
   i32.load
   i32.const 275760
   i32.eq
@@ -8830,14 +8965,14 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 344
+   i32.const 350
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $5
-  local.set $6
-  local.get $6
+  local.get $3
+  local.set $0
+  local.get $0
   i32.load offset=4
   i32.const 1
   i32.sub
@@ -8847,14 +8982,14 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 346
+   i32.const 352
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $1
-  local.set $4
-  local.get $4
+  local.get $6
+  local.set $5
+  local.get $5
   i32.load offset=4
   i32.const 1
   i32.sub
@@ -8864,14 +8999,14 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 347
+   i32.const 353
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $5
-  local.set $3
   local.get $3
+  local.set $4
+  local.get $4
   i32.load offset=8
   i32.const 20
   i32.eq
@@ -8879,14 +9014,14 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 349
+   i32.const 355
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
+  local.get $6
+  local.set $1
   local.get $1
-  local.set $2
-  local.get $2
   i32.load offset=8
   i32.const 13
   i32.eq
@@ -8894,12 +9029,12 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 350
+   i32.const 356
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $5
+  local.get $3
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8917,12 +9052,12 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 352
+   i32.const 358
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $1
+  local.get $6
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -8940,7 +9075,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 353
+   i32.const 359
    i32.const 3
    call $~lib/builtins/abort
    unreachable
@@ -8951,19 +9086,19 @@
   i64.const 1
   i64.sub
   call $~lib/date/Date#constructor
-  local.tee $2
-  i32.store offset=16
+  local.tee $1
+  i32.store
   global.get $~lib/memory/__stack_pointer
   i32.const 0
   i64.const -8640000000000000
   i64.const 1
   i64.add
   call $~lib/date/Date#constructor
-  local.tee $3
-  i32.store offset=12
-  local.get $3
-  local.set $0
-  local.get $0
+  local.tee $4
+  i32.store offset=24
+  local.get $4
+  local.set $2
+  local.get $2
   i32.load
   i32.const -271821
   i32.eq
@@ -8971,14 +9106,14 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 358
+   i32.const 364
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $3
-  local.set $6
-  local.get $6
+  local.get $4
+  local.set $0
+  local.get $0
   i32.load offset=4
   i32.const 1
   i32.sub
@@ -8988,14 +9123,14 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 359
+   i32.const 365
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $3
-  local.set $4
   local.get $4
+  local.set $5
+  local.get $5
   i32.load offset=8
   i32.const 20
   i32.eq
@@ -9003,12 +9138,12 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 360
+   i32.const 366
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $3
+  local.get $4
   call $~lib/date/Date#getUTCHours
   i32.const 0
   i32.eq
@@ -9016,12 +9151,12 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 361
+   i32.const 367
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $3
+  local.get $4
   call $~lib/date/Date#getUTCMinutes
   i32.const 0
   i32.eq
@@ -9029,12 +9164,12 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 362
+   i32.const 368
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $3
+  local.get $4
   call $~lib/date/Date#getUTCSeconds
   i32.const 0
   i32.eq
@@ -9042,12 +9177,12 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 363
+   i32.const 369
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $3
+  local.get $4
   call $~lib/date/Date#getUTCMilliseconds
   i32.const 1
   i32.eq
@@ -9055,12 +9190,12 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 364
+   i32.const 370
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $2
+  local.get $1
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -9078,12 +9213,12 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 366
+   i32.const 372
    i32.const 3
    call $~lib/builtins/abort
    unreachable
   end
-  local.get $3
+  local.get $4
   call $~lib/date/Date#toISOString
   local.set $8
   global.get $~lib/memory/__stack_pointer
@@ -9101,7 +9236,7 @@
   if
    i32.const 0
    i32.const 128
-   i32.const 367
+   i32.const 373
    i32.const 3
    call $~lib/builtins/abort
    unreachable
diff --git a/tests/compiler/std/date.release.wat b/tests/compiler/std/date.release.wat
index 8f122fe148..8c297b3419 100644
--- a/tests/compiler/std/date.release.wat
+++ b/tests/compiler/std/date.release.wat
@@ -25,6 +25,7 @@
  (global $~lib/rt/itcms/white (mut i32) (i32.const 0))
  (global $~lib/rt/itcms/fromSpace (mut i32) (i32.const 0))
  (global $~lib/rt/tlsf/ROOT (mut i32) (i32.const 0))
+ (global $~argumentsLength (mut i32) (i32.const 0))
  (global $~lib/memory/__stack_pointer (mut i32) (i32.const 23948))
  (global $~started (mut i32) (i32.const 0))
  (memory $0 1)
@@ -2016,95 +2017,109 @@
   i64.add
   call $~lib/date/Date#setTime
  )
- (func $~lib/date/Date#setUTCMonth (param $0 i32) (param $1 i32)
-  (local $2 i64)
-  (local $3 i32)
+ (func $~lib/date/Date#setUTCMonth@varargs (param $0 i32) (param $1 i32)
+  (local $2 i32)
+  (local $3 i64)
   (local $4 i32)
-  local.get $1
-  local.get $0
-  i32.load offset=4
-  i32.eq
-  if
-   return
+  block $1of1
+   block $0of1
+    block $outOfRange
+     global.get $~argumentsLength
+     i32.const 1
+     i32.sub
+     br_table $0of1 $1of1 $outOfRange
+    end
+    unreachable
+   end
+   local.get $0
+   i32.load offset=8
+   local.set $2
   end
   local.get $0
-  i32.load
+  i32.load offset=4
   local.get $1
   i32.const 1
   i32.add
-  local.tee $4
-  i32.const 2
-  i32.le_s
-  i32.sub
-  local.tee $3
-  local.get $3
-  i32.const 399
-  i32.sub
-  local.get $3
-  i32.const 0
-  i32.ge_s
-  select
-  i32.const 400
-  i32.div_s
-  local.set $1
-  local.get $0
-  i64.const 86400000
-  i64.const 0
-  local.get $0
-  i64.load offset=16
-  i64.const 86400000
-  i64.rem_s
-  local.tee $2
-  i64.const 0
-  i64.lt_s
-  select
-  local.get $2
-  i64.add
-  local.get $0
-  i32.load offset=8
-  i32.const -3
-  i32.const 9
-  local.get $4
-  i32.const 2
-  i32.gt_s
-  select
-  local.get $4
-  i32.add
-  i32.const 153
-  i32.mul
-  i32.const 2
-  i32.add
-  i32.const 5
-  i32.div_u
-  i32.add
-  local.get $3
-  local.get $1
-  i32.const 400
-  i32.mul
-  i32.sub
-  local.tee $0
-  i32.const 365
-  i32.mul
-  local.get $0
-  i32.const 2
-  i32.shr_u
-  i32.add
-  local.get $0
-  i32.const 100
-  i32.div_u
-  i32.sub
-  i32.add
-  local.get $1
-  i32.const 146097
-  i32.mul
-  i32.add
-  i32.const 719469
-  i32.sub
-  i64.extend_i32_s
-  i64.const 86400000
-  i64.mul
-  i64.add
-  call $~lib/date/Date#setTime
+  i32.ne
+  if
+   local.get $0
+   i64.const 86400000
+   i64.const 0
+   local.get $0
+   i64.load offset=16
+   i64.const 86400000
+   i64.rem_s
+   local.tee $3
+   i64.const 0
+   i64.lt_s
+   select
+   local.get $3
+   i64.add
+   local.get $0
+   i32.load
+   local.get $1
+   i32.const 1
+   i32.add
+   local.tee $1
+   i32.const 2
+   i32.le_s
+   i32.sub
+   local.tee $0
+   local.get $0
+   i32.const 399
+   i32.sub
+   local.get $0
+   i32.const 0
+   i32.ge_s
+   select
+   i32.const 400
+   i32.div_s
+   local.set $4
+   local.get $2
+   i32.const -3
+   i32.const 9
+   local.get $1
+   i32.const 2
+   i32.gt_s
+   select
+   local.get $1
+   i32.add
+   i32.const 153
+   i32.mul
+   i32.const 2
+   i32.add
+   i32.const 5
+   i32.div_u
+   i32.add
+   local.get $0
+   local.get $4
+   i32.const 400
+   i32.mul
+   i32.sub
+   local.tee $0
+   i32.const 365
+   i32.mul
+   local.get $0
+   i32.const 2
+   i32.shr_u
+   i32.add
+   local.get $0
+   i32.const 100
+   i32.div_u
+   i32.sub
+   i32.add
+   local.get $4
+   i32.const 146097
+   i32.mul
+   i32.add
+   i32.const 719469
+   i32.sub
+   i64.extend_i32_s
+   i64.const 86400000
+   i64.mul
+   i64.add
+   call $~lib/date/Date#setTime
+  end
  )
  (func $~lib/date/Date#setUTCFullYear (param $0 i32) (param $1 i32)
   (local $2 i64)
@@ -5923,9 +5938,11 @@
    local.get $0
    i32.const 30
    call $~lib/date/Date#setUTCDate
-   local.get $0
    i32.const 1
-   call $~lib/date/Date#setUTCMonth
+   global.set $~argumentsLength
+   local.get $0
+   i32.const 0
+   call $~lib/date/Date#setUTCMonth@varargs
    local.get $0
    i32.const 1
    call $~lib/date/Date#setUTCDate
@@ -5935,23 +5952,54 @@
    local.get $0
    i32.const 2024
    call $~lib/date/Date#setUTCFullYear
+   i32.const 1
+   global.set $~argumentsLength
    local.get $0
-   i32.const 2
-   call $~lib/date/Date#setUTCMonth
+   i32.const 1
+   call $~lib/date/Date#setUTCMonth@varargs
+   local.get $0
+   i32.load offset=4
+   i32.const 3
+   i32.ne
+   if
+    i32.const 0
+    i32.const 1152
+    i32.const 141
+    i32.const 3
+    call $~lib/builtins/abort
+    unreachable
+   end
    local.get $0
    i32.const 1
    call $~lib/date/Date#setUTCDate
    local.get $0
    i32.const 29
    call $~lib/date/Date#setUTCDate
+   i32.const 1
+   global.set $~argumentsLength
+   local.get $0
+   i32.const 1
+   call $~lib/date/Date#setUTCMonth@varargs
    local.get $0
    i64.load offset=16
-   i64.const 1711674191274
+   i64.const 1709168591274
    i64.ne
    if
     i32.const 0
     i32.const 1152
-    i32.const 144
+    i32.const 146
+    i32.const 3
+    call $~lib/builtins/abort
+    unreachable
+   end
+   local.get $0
+   i32.load offset=4
+   i32.const 2
+   i32.ne
+   if
+    i32.const 0
+    i32.const 1152
+    i32.const 147
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -5963,7 +6011,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 145
+    i32.const 148
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -5988,7 +6036,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 146
+    i32.const 149
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6013,7 +6061,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 147
+    i32.const 150
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6036,7 +6084,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 148
+    i32.const 151
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6056,7 +6104,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 152
+    i32.const 155
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6071,7 +6119,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 154
+    i32.const 157
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6086,7 +6134,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 157
+    i32.const 160
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6101,7 +6149,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 160
+    i32.const 163
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6116,7 +6164,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 163
+    i32.const 166
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6131,7 +6179,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 166
+    i32.const 169
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6151,7 +6199,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 170
+    i32.const 173
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6171,7 +6219,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 174
+    i32.const 177
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6244,7 +6292,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 184
+    i32.const 187
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6317,7 +6365,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 185
+    i32.const 188
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6390,7 +6438,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 186
+    i32.const 189
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6463,7 +6511,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 187
+    i32.const 190
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6536,7 +6584,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 189
+    i32.const 192
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6609,7 +6657,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 190
+    i32.const 193
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6682,7 +6730,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 191
+    i32.const 194
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6753,7 +6801,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 192
+    i32.const 195
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6770,14 +6818,16 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 198
+    i32.const 201
     i32.const 3
     call $~lib/builtins/abort
     unreachable
    end
+   i32.const 1
+   global.set $~argumentsLength
    local.get $0
    i32.const 10
-   call $~lib/date/Date#setUTCMonth
+   call $~lib/date/Date#setUTCMonth@varargs
    local.get $0
    i32.load offset=4
    i32.const 11
@@ -6785,14 +6835,16 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 200
+    i32.const 203
     i32.const 3
     call $~lib/builtins/abort
     unreachable
    end
+   i32.const 1
+   global.set $~argumentsLength
    local.get $0
    i32.const 2
-   call $~lib/date/Date#setUTCMonth
+   call $~lib/date/Date#setUTCMonth@varargs
    local.get $0
    i32.load offset=4
    i32.const 3
@@ -6800,7 +6852,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 202
+    i32.const 205
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6812,35 +6864,36 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 203
+    i32.const 206
     i32.const 3
     call $~lib/builtins/abort
     unreachable
    end
-   local.get $0
    i32.const 1
-   call $~lib/date/Date#setUTCMonth
+   global.set $~argumentsLength
    local.get $0
-   i32.const 12
-   call $~lib/date/Date#setUTCMonth
+   i32.const 0
+   call $~lib/date/Date#setUTCMonth@varargs
    local.get $0
    i64.load offset=16
-   i64.const 7899967616218720
+   i64.const 7899936080218720
    i64.ne
    if
     i32.const 0
     i32.const 1152
-    i32.const 207
+    i32.const 209
     i32.const 3
     call $~lib/builtins/abort
     unreachable
    end
+   i32.const 1
+   global.set $~argumentsLength
    local.get $0
-   i32.const 0
-   call $~lib/date/Date#setUTCMonth
+   i32.const 11
+   call $~lib/date/Date#setUTCMonth@varargs
    local.get $0
    i64.load offset=16
-   i64.const 7899967616218720
+   i64.const 7899964937818720
    i64.ne
    if
     i32.const 0
@@ -6850,17 +6903,60 @@
     call $~lib/builtins/abort
     unreachable
    end
+   i32.const 1
+   global.set $~argumentsLength
    local.get $0
-   i32.const 13
-   call $~lib/date/Date#setUTCMonth
+   i32.const -1
+   call $~lib/date/Date#setUTCMonth@varargs
+   local.get $0
+   i32.load offset=4
+   i32.const 12
+   i32.ne
+   if
+    i32.const 0
+    i32.const 1152
+    i32.const 215
+    i32.const 3
+    call $~lib/builtins/abort
+    unreachable
+   end
    local.get $0
    i64.load offset=16
-   i64.const 7900001830618720
+   i64.const 7899933401818720
    i64.ne
    if
     i32.const 0
     i32.const 1152
-    i32.const 213
+    i32.const 216
+    i32.const 3
+    call $~lib/builtins/abort
+    unreachable
+   end
+   i32.const 1
+   global.set $~argumentsLength
+   local.get $0
+   i32.const 12
+   call $~lib/date/Date#setUTCMonth@varargs
+   local.get $0
+   i32.load offset=4
+   i32.const 1
+   i32.sub
+   if
+    i32.const 0
+    i32.const 1152
+    i32.const 218
+    i32.const 3
+    call $~lib/builtins/abort
+    unreachable
+   end
+   local.get $0
+   i64.load offset=16
+   i64.const 7899936080218720
+   i64.ne
+   if
+    i32.const 0
+    i32.const 1152
+    i32.const 219
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6877,7 +6973,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 219
+    i32.const 225
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6892,7 +6988,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 221
+    i32.const 227
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6907,7 +7003,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 223
+    i32.const 229
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6922,7 +7018,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 225
+    i32.const 231
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6948,7 +7044,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 231
+    i32.const 237
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -6974,7 +7070,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 233
+    i32.const 239
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7000,7 +7096,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 235
+    i32.const 241
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7026,7 +7122,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 237
+    i32.const 243
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7052,7 +7148,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 239
+    i32.const 245
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7078,7 +7174,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 241
+    i32.const 247
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7104,7 +7200,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 243
+    i32.const 249
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7130,7 +7226,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 245
+    i32.const 251
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7156,7 +7252,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 247
+    i32.const 253
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7182,7 +7278,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 253
+    i32.const 259
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7208,7 +7304,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 255
+    i32.const 261
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7234,7 +7330,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 258
+    i32.const 264
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7260,7 +7356,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 264
+    i32.const 270
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7286,7 +7382,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 267
+    i32.const 273
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7312,7 +7408,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 273
+    i32.const 279
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7338,7 +7434,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 275
+    i32.const 281
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7364,7 +7460,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 278
+    i32.const 284
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7385,7 +7481,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 285
+    i32.const 291
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7406,7 +7502,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 287
+    i32.const 293
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7427,7 +7523,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 289
+    i32.const 295
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7448,7 +7544,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 293
+    i32.const 299
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7469,7 +7565,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 297
+    i32.const 303
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7490,7 +7586,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 301
+    i32.const 307
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7511,7 +7607,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 304
+    i32.const 310
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7532,7 +7628,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 307
+    i32.const 313
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7553,7 +7649,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 310
+    i32.const 316
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7574,7 +7670,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 313
+    i32.const 319
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7595,7 +7691,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 316
+    i32.const 322
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7616,7 +7712,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 319
+    i32.const 325
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7637,7 +7733,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 322
+    i32.const 328
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7651,7 +7747,7 @@
    i64.const 8640000000000000
    call $~lib/date/Date#constructor
    local.tee $2
-   i32.store
+   i32.store offset=16
    local.get $0
    i64.load offset=16
    i64.const -8640000000000000
@@ -7659,7 +7755,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 340
+    i32.const 346
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7671,7 +7767,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 341
+    i32.const 347
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7683,7 +7779,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 343
+    i32.const 349
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7695,7 +7791,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 344
+    i32.const 350
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7707,7 +7803,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 346
+    i32.const 352
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7719,7 +7815,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 347
+    i32.const 353
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7731,7 +7827,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 349
+    i32.const 355
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7743,7 +7839,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 350
+    i32.const 356
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7765,7 +7861,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 352
+    i32.const 358
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7787,7 +7883,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 353
+    i32.const 359
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7796,12 +7892,12 @@
    i64.const 8639999999999999
    call $~lib/date/Date#constructor
    local.tee $0
-   i32.store offset=16
+   i32.store
    global.get $~lib/memory/__stack_pointer
    i64.const -8639999999999999
    call $~lib/date/Date#constructor
    local.tee $2
-   i32.store offset=12
+   i32.store offset=24
    local.get $2
    i32.load
    i32.const -271821
@@ -7809,7 +7905,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 358
+    i32.const 364
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7821,7 +7917,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 359
+    i32.const 365
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7833,7 +7929,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 360
+    i32.const 366
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7856,7 +7952,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 361
+    i32.const 367
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7879,7 +7975,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 362
+    i32.const 368
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7902,7 +7998,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 363
+    i32.const 369
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7925,7 +8021,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 364
+    i32.const 370
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7947,7 +8043,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 366
+    i32.const 372
     i32.const 3
     call $~lib/builtins/abort
     unreachable
@@ -7969,7 +8065,7 @@
    if
     i32.const 0
     i32.const 1152
-    i32.const 367
+    i32.const 373
     i32.const 3
     call $~lib/builtins/abort
     unreachable
diff --git a/tests/compiler/std/date.ts b/tests/compiler/std/date.ts
index 87cbab1df5..c2152d8aa4 100644
--- a/tests/compiler/std/date.ts
+++ b/tests/compiler/std/date.ts
@@ -131,17 +131,20 @@
   date.setUTCDate(30);
 
   // jan has 31 days
-  date.setUTCMonth(1);
+  date.setUTCMonth(0);
   date.setUTCDate(1);
   date.setUTCDate(31);
 
   // feb on leap year
   date.setUTCFullYear(2024);
-  date.setUTCMonth(2);
+  date.setUTCMonth(1);
+  assert(date.getUTCMonth() == 2); // overflows to march due to day=31
   date.setUTCDate(1);
   date.setUTCDate(29);
+  date.setUTCMonth(1);
 
-  assert(date.getTime() == 1711674191274);
+  assert(date.getTime() == 1709168591274);
+  assert(date.getUTCMonth() == 1);
   assert(date.getUTCDate() == 29);
   assert(date.getUTCMinutes() == 3);
   assert(date.getUTCSeconds() == 11);
@@ -202,15 +205,18 @@
   assert(date.getUTCMonth() == 2);
   assert(date.getTime() == 7899941177818720);
   // test boundaries
-  date.setUTCMonth(1);
-  date.setUTCMonth(12);
-  assert(date.getTime() == 7899967616218720);
+  date.setUTCMonth(0);
+  assert(date.getTime() == 7899936080218720);
+  date.setUTCMonth(11);
+  assert(date.getTime() == 7899964937818720);
 
   // test out of boundaries
-  date.setUTCMonth(0);
-  assert(date.getTime() == 7899967616218720);
-  date.setUTCMonth(13);
-  assert(date.getTime() == 7900001830618720);
+  date.setUTCMonth(-1);
+  assert(date.getUTCMonth() == 11);
+  assert(date.getTime() == 7899933401818720);
+  date.setUTCMonth(12);
+  assert(date.getUTCMonth() == 0);
+  assert(date.getTime() == 7899936080218720);
 }
 
 // Date#setUTCFullYear /////////////////////////////////////////////////////////////////////////////