Unfortunately, I'm not aware of a mapping from the .NET time zones to the
API time zones. However, you can download the API time zones as a CSV and use that to create a mapping for the time zones you'll need. I wouldn't expect changes to either side of the mapping, so you should only have to do that once. You may want to file an issue on the
.NET library issues page to ask for this mapping to be included in the library as well.
That being said, if anyone else on the forum has already created this type of utility, please chime in!