how many time zones are there?

.net, c#, timezone

Solution

There's no one answer - it depends on what time zone database you're interested in. Using `TimeZoneInfo.GetSystemTimeZones` will use the Windows time zones... if you use tzdb you're likely to see a lot more.

(The current Noda Time version returns 575 time zone IDs, for example, although that includes Etc/GMT+9, Etc/GMT+10 etc.)

Problem

I'm not sure whether this is an SO question but still would like to know the answer. Wikipedia says there are about 40 time zones, but when I invoke the `TimeZoneInfo.GetSystemTimeZones()` method in c# it returns a list of 101 elements. Is the wiki article outdated (though it "was last modified on 26 April 2012 at 05:11") or are there any additional time zones?

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