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NSTimeZone: Use GetDynamicTimeZoneInformation

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tz.StandardName is not always available, does not represent the raw
timezone key from the registry. It appears that ucal_getTimeZoneIDForWindowsID
maps the registry key to a compatible IANA time zone.

The dotnet and flutter implementations also use
GetDynamicTimeZoneInformation and use TimeZoneKeyName.

Here is an example for Asia/Singapore:
StandardTime = Malay Peninsula Standard Time
TimeZoneKeyName = Singapore Standard Time

StandardTime is not registered in the IANA database.
This commit is contained in:
hmelder 2025-04-18 16:54:15 +08:00 committed by Hugo Melder
parent 283ecfe8b2
commit 0606cb9db4
1 changed files with 4 additions and 5 deletions
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9
Source/NSTimeZone.m
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@ -1462,7 +1462,7 @@ static int uninitialisedOffset = 100000;
* Try to get timezone from windows system call.
*/
{
TIME_ZONE_INFORMATION tz;
DYNAMIC_TIME_ZONE_INFORMATION tz;
DWORD dst;
wchar_t *tzName;
@ -1470,15 +1470,14 @@ static int uninitialisedOffset = 100000;
// Get time zone name for US locale as expected by ICU method below
LANGID origLangID = GetThreadUILanguage();
SetThreadUILanguage(MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US));
dst = GetTimeZoneInformation(&tz);
dst = GetDynamicTimeZoneInformation(&tz);
SetThreadUILanguage(origLangID);
// Only tz.StandardName time zone conversions are supported, as
// the Zone-Tzid table lacks all daylight time conversions:
// The Zone-Tzid table lacks all daylight time conversions:
// e.g. 'W. Europe Daylight Time' <-> 'Europe/Berlin' is not listed.
//
// See: https://unicode-org.github.io/cldr-staging/charts/latest/supplemental/zone_tzid.html
tzName = tz.StandardName;
tzName = tz.TimeZoneKeyName;
#else
dst = GetTimeZoneInformation(&tz);