Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-80421

Use DST data even before 1970

    XMLWordPrintable

Details

    • Suggestion
    • Resolution: Done
    • P2: Important
    • 6.2.0 FF
    • 5.0.0, 5.9, 5.14, 6.0.0, 5.15
    • Core: Date/Time
    • All
    • 13
    • 35412acd88cad2213be966a950f3112342a299ae (qt/qtbase/dev)
    • Qt6_Foundation_Sprint 28, Qt6_Foundation_Sprint 29, Qt6_Foundation_Sprint 30, Qt6_Foundation_Sprint 31, Qt6_Foundation_Sprint 32, Qt6_Foundation_Sprint 33, Qt6_Foundation_Sprint 34

    Description

      At present the QDateTime code goes out of its way to ignore DST before 1970, although it does use the available time-zone data to determine the standard time offset to use instead of DST. This makes no sense.
      I shall remove this at Qt6, so that we just use the time-zone data we have, with no special quirk about 1970.

      (On MS-Windows, when using the native TZ-data APIs, we only get data reaching back a few years before the MS-version was released. Everywhere else (including MS, when we have ICU available) we use the Olson database, which is about as authoritative a source of TZ data as there is.)

      Attachments

        Issue Links

          is required for

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-80575 Qt/QML, QDateTime losing an hour when coming into QML

          • 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-73225 QT DST beyond 2037

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed

          User Story - Created by Jira Software - do not edit or delete. Issue type for a user story. QTBUG-79923 Equip QDateTime to distinguish the two passes through an "overlap" hour during a time-zone fall-back, such as the end of DST

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

          Epic - Created by Jira Software - do not edit or delete. Issue type for a big user story that needs to be broken down. QTBUG-71036 Qt Core Changes in Qt 6

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          No reviews matched the request. Check your Options in the drop-down menu of this sections header.

          Activity

            People

              Eddy Edward Welbourne
              Eddy Edward Welbourne
              Vladimir Minenko Vladimir Minenko
              Alex Blasche Alex Blasche
              Votes:
              0 Vote for this issue
              Watchers:
              0 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

                Gerrit Reviews

                  There are no open Gerrit changes