How does DateTime.ToUniversalTime() work?

Question

How does the conversion to UTC from the standard DateTime format work?

More specifically, if I create a DateTime object in one time zone an

Answer 1

DateTime.ToUniversalTime removes the timezone offset of the local timezone to normalize a DateTime to UTC. If you then use DateTime.ToLocalTime on the normalized value in another timezone, the timezone offset of that timezone will be added to the normalized value for correct representation in that timezone.