local time zone is not part of system time zones

Question

I am using Quartz.net scheduling framework. When I add a rule it uses TimeZoneInfo.Local to get the local time zone.

When I want to delete a rule for some reason it searches the time zone in system times zones by id, using:

TimeZoneInfo.FindSystemTimeZoneById 

Usually this works fine, but I have one client with windows server 2008R2, configured to be in Jerusalem standard time.

So in this case TimeZoneInfo.Local returns : "Jerusalem standard time" But this is not a key in the registry , it should be: "Israel Standard time" This causes the entire action to fail. What's up with that? That makes no sense to me...

Answer 1

The reason is because something is using the TimeZoneInfo.StandardName instead of the TimeZoneInfo.ID. For all timezones these values are identical, with the exception of 3 timezones, and "Jerusalem Standard Time" is one of those 3.

See the following link for the full explanation: Why are some time zones returned by GetSystemTimeZones not found by FindSystemTimeZoneById?