How Does .NET 6 Handle Conversions Between Windows and IANA Time Zones?

.NET 6 Windows and IANA time zone conversion methods

Platform support the status quo

From the .NET 6, all platforms with time zone data and ICU support Windows and Iana time zone formats. This includes most Windows, Linux and MacOS systems.

History method

Before the unified time zone of the .NET 6 was implemented, the main data sources converted between Windows and IANA time zones were Windowszones.xml files distributed with the Unicode CLDR project. However, the challenges and restrictions brought by the irregular release rhythm of CLDR and Windows require a more comprehensive solution.

Timezoneconverter Library

TimezoneConverter miniature library (obtained on Nuget) encapsulates the complexity of the time zone conversion. The method of use is very simple, as shown in the following example:

Ambiguous places and precautions

// 将 IANA 时区转换为 Windows 时区
string windowsTimeZone = TZConvert.IanaToWindows("America/New_York");

// 将 Windows 时区转换为 IANA 时区
string ianaTimeZone = TZConvert.WindowsToIana("Eastern Standard Time");

// 使用国家代码将 Windows 时区转换为 IANA 时区
string ianaTimeZoneWithCountry = TZConvert.WindowsToIana("Eastern Standard Time", "CA");

It is worth noting that although the IANA time zone is mapped to a single Windows time zone, it is not always the case. A single Windows time zone can correspond to multiple IANA time zones. TimezoneConverter usually returns the code specified by CLDR as "001" "Golden Times". However, if a national code is provided, it may return different matching time zones.

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