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Type: Task
Resolution: Unresolved
Priority: P3: Somewhat important
Fix Version/s: None
Affects Version/s: None
Component/s: Core: Date/Time
Labels:
None
Environment:

All, C++20

Epic Link:
[Initiative] C++20 @ Qt
Story Points:
8
Sprint:
Foundation PM Staging

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.

is blocked by

QTBUG-107201 Spike: Look into std::chrono::tzdb's APIs, work out how much work QTBUG-68812 will take

Closed

relates to

QTBUG-88858 VxWorks 7 does not support any of the existing QTimeZone backends

Reported

QTBUG-102042 Look into using libicu on Android (>= 12)

Reported

QTBUG-71036 Qt Core Changes in Qt 6

Closed

QTBUG-91441 Support timezones on WASM

Reported

QTBUG-102047 Windows SDK ships a subset of ICU and does not get picked up by CMake because of it

Reported

QTBUG-112006 Separate out POSIX zone descriptors in QTimeZone backends

Reported

QTBUG-101730 Research and implement QDateTime/etc. <=> C++20 calendaring integration

Open

replaces

QTBUG-102187 QTimeZone on Windows (w/o ICU) does not recognize some time zones reported by C++20

Reported

(3 relates to, 1 replaces)

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For Gerrit Dashboard: QTBUG-68812
#	Subject	Branch	Project	Status	CR	V
544309,37	Implement feature timezone_locale's CLDR half	dev	qt/qtbase	Status: MERGED	+2	0
562891,29	QTimeZone: Add back-end based on std::chrono::tzdb	dev	qt/qtbase	Status: MERGED	+2	0
567919,6	Reorder QTimeZonePrivate platform backend cascade to a #elif chain	dev	qt/qtbase	Status: MERGED	+2	0
577136,1	QTimeZone: Add back-end based on std::chrono::tzdb	dev	qt/qtbase	Status: ABANDONED	0	0
601438,5	Add missing QChronoTimezonePrivate::clone()	dev	qt/qtbase	Status: MERGED	+2	0