[JS/TS] Tests fail on timezone Australia/Melbourne (should works perhaps)

[olivercoad]

In Australia/Melbourne the typescript and javascript tests have failing cases

  2603 passing (8s)
  3 failing

  1) DateTimeOffset
       DateTimeOffset.ToString('D') works:

      Expected: Monday, 01 September 2014 - Actual: Tuesday, 02 September 2014
      + expected - actual

      -Tuesday, 02 September 2014
      +Monday, 01 September 2014
      
  

  2) DateTimeOffset
       DateTimeOffset.ToString('d') works:

      Expected: 09/01/2014 - Actual: 09/02/2014
      + expected - actual

      -09/02/2014
      +09/01/2014
      
  

  3) DateTimeOffset
       DateTimeOffset.LocalDateTime works:

      Expected: 9 - Actual: 10
      + expected - actual

      -10
      +9

[MangelMaxime]

Hello,

This is a known issue unfortunately there is no easy fix for it.

Duplicate of #2375

One way to work around the issue, is by using VSCode dev container to work on the test as the container is configured with the right timezone. (Europe/Paris).

If you don't want/can't use dev container you can try to configure TZ=Europe/Paris before spawning the test process.

[olivercoad]

I'm not convinced that's right. I saw that issue, but it's about a test that's commented out and would legitimately be expected to fail in other timezones.

• The first two tests are for testing formatting, not the behavior of local timezones. I would not expect the formatted values to change depending on the local timezone. Indeed, if I execute it in dotnet rather than in javascript, they do not fail. This indicates it could be a bug in the fable js library.
• The third test does depend on local timezone and would be expected to fail in certain timezones. I think it would be reasonable to modify this test, because LocalDateTime is already tested more thoroughly in other test cases which actually take that into account.

[MangelMaxime]

Sorry, because of the issue title I though you were saying that the tests were failing because of the Timezone and not because their could be an issue in the implementation.