Bug 1799638 Comment 6 Edit History

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Original comment by
on 
I've reproduced this issue in Firefox v107.0 and verified the fix in Beta v108.0b4 and Nightly v109.0a1 In Windows 10.

Test results:
* Tokyo Time Zone:
  * Release v107.0: 
    * console.log((new Date("1948-05-01T23:59:59")));  ->  Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000"))); -> Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.001"))); -> Date Sun May 02 1948 00:59:59 GMT+1000 (Japan Daylight Time) (**INCORRECT**)
    * console.log((new Date("1948-05-01T23:59:59.001")).getTimezoneOffset()); -> -600 (**INCORRECT**)
    * console.log((new Date("1948-05-02T00:00:00"))); -> Date Sun May 02 1948 01:00:00 GMT+1000 (Japan Daylight Time) (CORRECT?)
    * console.log((new Date("1948-05-02T00:00:00")).getTimezoneOffset()); -> -600 (CORRECT?)
  * Beta v108.0b4:
    * console.log((new Date("1948-05-01T23:59:59")));  ->  Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000"))); -> Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.001"))); -> Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (**CORRECTED!**)
    * console.log((new Date("1948-05-01T23:59:59.001")).getTimezoneOffset()); -> -540 (**CORRECTED!**)
    * console.log((new Date("1948-05-02T00:00:00"))); -> Date Sun May 02 1948 01:00:00 GMT+1000 (Japan Daylight Time) (CORRECT?)
    * console.log((new Date("1948-05-02T00:00:00")).getTimezoneOffset()); -> -600 (CORRECT?)
  * Nightly v109.0a1:
    * console.log((new Date("1948-05-01T23:59:59")));  ->  Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000"))); -> Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.001"))); -> Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (**CORRECTED!**)
    * console.log((new Date("1948-05-01T23:59:59.001")).getTimezoneOffset()); -> -540 (**CORRECTED!**)
    * console.log((new Date("1948-05-02T00:00:00"))); -> Date Sun May 02 1948 01:00:00 GMT+1000 (Japan Daylight Time) (CORRECT?)
    * console.log((new Date("1948-05-02T00:00:00")).getTimezoneOffset()); -> -600 (CORRECT?)
Revision 1 by
on 
I've reproduced this issue in Firefox v107.0 and verified the fix in Beta v108.0b4 and Nightly v109.0a1 In Windows 10.

Test results:
* Tokyo Time Zone:
  * Release v107.0: 
    * console.log((new Date("1948-05-01T23:59:59")));  ->  Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000"))); -> Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.001"))); -> Date Sun May 02 1948 00:59:59 GMT+1000 (Japan Daylight Time) (**INCORRECT**)
    * console.log((new Date("1948-05-01T23:59:59.001")).getTimezoneOffset()); -> -600 (**INCORRECT**)
    * console.log((new Date("1948-05-02T00:00:00"))); -> Date Sun May 02 1948 01:00:00 GMT+1000 (Japan Daylight Time) (CORRECT)
    * console.log((new Date("1948-05-02T00:00:00")).getTimezoneOffset()); -> -600 (CORRECT)
  * Beta v108.0b4:
    * console.log((new Date("1948-05-01T23:59:59")));  ->  Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000"))); -> Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.001"))); -> Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (**CORRECTED!**)
    * console.log((new Date("1948-05-01T23:59:59.001")).getTimezoneOffset()); -> -540 (**CORRECTED!**)
    * console.log((new Date("1948-05-02T00:00:00"))); -> Date Sun May 02 1948 01:00:00 GMT+1000 (Japan Daylight Time) (CORRECT)
    * console.log((new Date("1948-05-02T00:00:00")).getTimezoneOffset()); -> -600 (CORRECT)
  * Nightly v109.0a1:
    * console.log((new Date("1948-05-01T23:59:59")));  ->  Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000"))); -> Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.000")).getTimezoneOffset()); -> -540 (CORRECT)
    * console.log((new Date("1948-05-01T23:59:59.001"))); -> Date Sat May 01 1948 23:59:59 GMT+0900 (Japan Standard Time) (**CORRECTED!**)
    * console.log((new Date("1948-05-01T23:59:59.001")).getTimezoneOffset()); -> -540 (**CORRECTED!**)
    * console.log((new Date("1948-05-02T00:00:00"))); -> Date Sun May 02 1948 01:00:00 GMT+1000 (Japan Daylight Time) (CORRECT)
    * console.log((new Date("1948-05-02T00:00:00")).getTimezoneOffset()); -> -600 (CORRECT)

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