Updating User TimeZone

TimeZoneId compares to the TimeZoneInfo.Id that .Net provides.  TimeZone is the UtcOffset and it will match to the first time zone with that offset.  So you could get the incorrect time zone if more than one share the same offset.  Also if you provide an offset that does not match it will truncate the minutes and look for a time zone with the same hour offset.

TimeZoneId compares to the TimeZoneInfo.Id that .Net provides.  TimeZone is the UtcOffset and it will match to the first time zone with that offset.  So you could get the incorrect time zone if more than one share the same offset.  Also if you provide an offset that does not match it will truncate the minutes and look for a time zone with the same hour offset.

It would be great to be able to update users timezone based on the name returned form Javascript. For example:

Since we use SSO, our users timezone is not set unless they change it manually which the majority of them did not. Using the above works, however the timezone name is incorrect.

Javascript uses a different standard for timezones, you will have to reconcile this yourself.

Are we able to set timeline based off name. With the response above I thought only the offset. 

See the answer above, Id is the name as it is referenced by .NET