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  1. Qt
  2. QTBUG-95993

QML Date operations are wrong when DST is active

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    Details

    • Platform/s:
      Windows
    • Story Points:
      13
    • Commits:
      dff02466a0 (qt/qtdeclarative/dev) 3033e99fa8 (qt/qtdeclarative/6.4) 3033e99fa8 (qt/tqtc-qtdeclarative/6.4)
    • Sprint:
      Team A Foundation Sprint 56, Team A Foundation Sprint 57, Team A Foundation Sprint 58, Team A Foundation Sprint 59

      Description

      Steps to reproduce

      1. Set your PC's Region to France and Time Zone to "(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna" (CEST)
      2. Add this to a Hello World QML project:

       

      Component.onCompleted: {
    let d = new Date()
    console.log("Now: " + d)
    d.setHours(0, 0, 0)
    console.log("Midnight: " + d)
}

       

       

      MSVC 2019 64-bit results (correct)

      qml: Now: Tue Aug 24 15:37:35 2021 GMT+0200

      qml: Midnight: Tue Aug 24 00:00:00 2021 GMT+0200

       

      MinGW 8.1.0 64-bit results (wrong)

      qml: Now: Tue Aug 24 15:37:41 2021 GMT+0100

      qml: Midnight: Tue Aug 24 01:00:00 2021 GMT+0100

       

      • 1st line shows the correct local time but the wrong timezone 
      • 2nd line does not show midnight (and also shows the wrong timezone)

        Attachments

          Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-102971 Something fishy going on on MinGW with QML Date

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-78996 JavaScript getDay() regression on MinGW

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-100014 tst_qqmlqt fails on Android

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Task - A task that needs to be done. QTBUG-85149 qv4dateobject.cpp uses incorrect daylight savings calculation

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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            Activity

              People

              Assignee:
              Eddy Edward Welbourne
              Reporter:
              skoh-qt Sze Howe Koh
              PM Owner:
              Vladimir Minenko Vladimir Minenko
              RnD Owner:
              Alex Blasche Alex Blasche
              Votes:
              1 Vote for this issue
              Watchers:
              8 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved: