How to Efficiently Translate Between Windows and IANA Time Zones in .NET?

.NET Time Zone Conversion: Windows vs. IANA

.NET handles time zones using two systems: Windows time zones (e.g., "Eastern Standard Time") and IANA time zones (e.g., "America/New_York"). While IANA is the standard for internet APIs, converting between the two is often necessary.

Legacy Approach: TimeZoneConverter Library

Prior to .NET 6, the windowsZones.xml file (from the Unicode CLDR project) was the primary method for conversion. However, limitations led to the creation of the TimeZoneConverter NuGet package, offering a more reliable solution.

Here's how TimeZoneConverter simplifies the process:

string tz = TZConvert.IanaToWindows("America/New_York"); // Returns: "Eastern Standard Time"

string tz = TZConvert.WindowsToIana("Eastern Standard Time"); // Returns: "America/New_York"

string tz = TZConvert.WindowsToIana("Eastern Standard Time", "CA"); // Returns: "America/Toronto"

Modern Approach: .NET 6 and Beyond

.NET 6 and later versions provide built-in support for both Windows and IANA time zones on systems with the necessary time zone data and ICU (International Components for Unicode). This simplifies direct conversion:

TimeZoneInfo windowsZone = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");
TimeZoneInfo ianaZone = TimeZoneInfo.FindSystemTimeZoneById("America/New_York");

It's important to note that a single Windows time zone might map to several IANA zones. The default is the "golden zone" (CLDR's "001"). To specify a different match, use a country code (as shown in the TimeZoneConverter example using "CA").

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