Missing Microsoft time zones

Question

I'm looking at using the Microsoft time zones (by utilising the System.TimeZoneInfo class in C#) to convert stored UTC dates to local timezone dates and vice versa.

However, I've noticed that this isn't a comprehensive list. For example, it currently only has one timezone defined for Greenland ( Greenland Standard Time (GMT-03:00) Greenland ), where wikipedia and timeanddate both show there are 2 major time zones in use (eastern and western) as well as 2 lesser used ones.

Is there a comprehensive list anywhere of missing timezones?

Answer 1

The conversion data between Windows time zone IDs and IANA time zone IDs is available via CLDR .

Looking at the data (and at the raw IANA data in Github ) it looks like the IANA time zones in question are:

• "America/Godthab" (West Greenland)
• "America/Scoresbysund" (East Greenland)

Those have corresponding Windows time zone IDs of:

• "Greenland Standard Time" (West Greenland)
• "Azores Standard Time" (um, not really East Greenland - read on)

Obviously the Azores and East Greenland are quite a long way apart - but it turns out they follow the same time zone rules, which is presumably why Microsoft has lumped them under a single time zone.

Basically, if you want to find the time in East Greenland for "America/Scoresbysund", then "Azores Standard Time" is your closest bet.