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  1. Qt
  2. QTBUG-68812

Add a QTimeZone back-end based on C++20 std::chrono::tzdb

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Details

    • Task
    • Resolution: Unresolved
    • P3: Somewhat important
    • None
    • None
    • Core: Date/Time
    • None
    • All, C++20

    • 8
    • 678f6d472 (dev)
    • Foundation Sprint 109, Foundation Sprint 110, Foundation Sprint 111, Foundation Sprint 112

    Description

      In C++20, <tz.h> std::chrono::tzdb will provide access to the Olson database.
      This should be sufficient to implement a back-end for QTimeZone; ultimately (some time in the late 2020s) we can hope for it to make all others redundant.
      As discussed at QtCS2018 it's worth getting it implemented early,

      • so that we'll have all the bugs out of it by that time; and
      • so that we notice (and address) any limitations in the <tz.h> API that we want fixed before it gets fossilized by standardization – too late for that.

      Once we have this backend, the intent is to use it whenever it is supported, making the other backends redundant. This makes QTBUG-101730's call to include conversion from std::chrono::time_zone to QTimeZone trivial, provided we include a constructor from time_zone when using this backend.

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          For Gerrit Dashboard: QTBUG-68812
          # Subject Branch Project Status CR V

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              magdalenas Magdalena Stojek
              Eddy Edward Welbourne
              Vladimir Minenko Vladimir Minenko
              Alex Blasche Alex Blasche
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