awesome-copilot/skills/dotnet-timezone/references/timezone-index.md

.NET Timezone Reference Index

Windows To IANA Mapping

Use this file for common mappings between Windows timezone IDs and IANA timezone IDs.

Asia And Pacific

Display Name	Windows ID	IANA ID	UTC Offset	DST?
Sri Lanka Standard Time	Sri Lanka Standard Time	Asia/Colombo	+05:30	No
India Standard Time	India Standard Time	Asia/Calcutta	+05:30	No
Pakistan Standard Time	Pakistan Standard Time	Asia/Karachi	+05:00	No
Bangladesh Standard Time	Bangladesh Standard Time	Asia/Dhaka	+06:00	No
Nepal Standard Time	Nepal Standard Time	Asia/Katmandu	+05:45	No
SE Asia Standard Time	SE Asia Standard Time	Asia/Bangkok	+07:00	No
Singapore Standard Time	Singapore Standard Time	Asia/Singapore	+08:00	No
China Standard Time	China Standard Time	Asia/Shanghai	+08:00	No
Tokyo Standard Time	Tokyo Standard Time	Asia/Tokyo	+09:00	No
Korea Standard Time	Korea Standard Time	Asia/Seoul	+09:00	No
AUS Eastern Standard Time	AUS Eastern Standard Time	Australia/Sydney	+10:00/+11:00	Yes
New Zealand Standard Time	New Zealand Standard Time	Pacific/Auckland	+12:00/+13:00	Yes
Arabian Standard Time	Arabian Standard Time	Asia/Dubai	+04:00	No
Arab Standard Time	Arab Standard Time	Asia/Riyadh	+03:00	No
Israel Standard Time	Israel Standard Time	Asia/Jerusalem	+02:00/+03:00	Yes
Turkey Standard Time	Turkey Standard Time	Europe/Istanbul	+03:00	No

Europe

Display Name	Windows ID	IANA ID	UTC Offset	DST?
UTC	UTC	Etc/UTC	+00:00	No
GMT Standard Time	GMT Standard Time	Europe/London	+00:00/+01:00	Yes
W. Europe Standard Time	W. Europe Standard Time	Europe/Berlin	+01:00/+02:00	Yes
Central Europe Standard Time	Central Europe Standard Time	Europe/Budapest	+01:00/+02:00	Yes
Romance Standard Time	Romance Standard Time	Europe/Paris	+01:00/+02:00	Yes
E. Europe Standard Time	E. Europe Standard Time	Asia/Nicosia	+02:00/+03:00	Yes
GTB Standard Time	GTB Standard Time	Europe/Bucharest	+02:00/+03:00	Yes
Russian Standard Time	Russian Standard Time	Europe/Moscow	+03:00	No

Americas

Display Name	Windows ID	IANA ID	UTC Offset	DST?
Eastern Standard Time	Eastern Standard Time	America/New_York	-05:00/-04:00	Yes
Central Standard Time	Central Standard Time	America/Chicago	-06:00/-05:00	Yes
Mountain Standard Time	Mountain Standard Time	America/Denver	-07:00/-06:00	Yes
Pacific Standard Time	Pacific Standard Time	America/Los_Angeles	-08:00/-07:00	Yes
Alaskan Standard Time	Alaskan Standard Time	America/Anchorage	-09:00/-08:00	Yes
Hawaiian Standard Time	Hawaiian Standard Time	Pacific/Honolulu	-10:00	No
Canada Central Standard Time	Canada Central Standard Time	America/Regina	-06:00	No
SA Eastern Standard Time	SA Eastern Standard Time	America/Cayenne	-03:00	No
E. South America Standard Time	E. South America Standard Time	America/Sao_Paulo	-03:00/-02:00	Yes

Africa

Display Name	Windows ID	IANA ID	UTC Offset	DST?
South Africa Standard Time	South Africa Standard Time	Africa/Johannesburg	+02:00	No
Egypt Standard Time	Egypt Standard Time	Africa/Cairo	+02:00	No
E. Africa Standard Time	E. Africa Standard Time	Africa/Nairobi	+03:00	No
W. Central Africa Standard Time	W. Central Africa Standard Time	Africa/Lagos	+01:00	No
Morocco Standard Time	Morocco Standard Time	Africa/Casablanca	+00:00/+01:00	Yes

NodaTime Providers

DateTimeZoneProviders.Tzdb["Asia/Colombo"]
DateTimeZoneProviders.Bcl["Sri Lanka Standard Time"]

TimeZoneConverter Examples

string ianaId = TZConvert.WindowsToIana("Sri Lanka Standard Time");
string windowsId = TZConvert.IanaToWindows("Asia/Colombo");
TimeZoneInfo tz = TZConvert.GetTimeZoneInfo("Asia/Colombo");

Programmatic Discovery

foreach (var tz in TimeZoneInfo.GetSystemTimeZones())
{
    Console.WriteLine($"ID: {tz.Id} | Display: {tz.DisplayName}");
}