[Mono-dev] TimeZoneInfo.Local on Windows

Jonathan Shore jonathan.shore at gmail.com
Tue Jan 3 18:02:21 EST 2012

So I have a mono application which works fine on OSX and Linux that uses System.TimeZoneInfo.Local, amongst other TimeZoneInfo facilities.

On windows calling TimeZoneInfo.Local throws a TimeZoneNotFoundException.

Looking at the class library code in "mcs/class/System.Core/System/TimeZoneInfo.cs" it is clear why this will throw an exception:

public static TimeZoneInfo Local {
	get { 
		if (local == null) {
			local = ZoneInfoDB.Default;
			using (Stream stream = GetMonoTouchDefault ()) {
				return BuildFromStream ("Local", stream);
#elif LIBC
			try {
				local = FindSystemTimeZoneByFileName ("Local", "/etc/localtime");	
			} catch {
				try {
					local = FindSystemTimeZoneByFileName ("Local", Path.Combine (TimeZoneDirectory, "localtime"));				} catch {
					throw new TimeZoneNotFoundException ();
			throw new TimeZoneNotFoundException ();
		return local;

I noticed that there is windows specific code to find the time zone info in the registry for FindSystemTimeZoneById().  Is there not a setting in the registry which indicates which of these timezones is local?

The code looks broken for windows, proper on unix variants, and covered on Andriod and iOS.

Any pointers / comments on a fix or workaround for this?


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