TimeZone and TimeZoneInfo

The TimeZone and TimeZoneInfo classes provide information on time zone names, UTC offsets, and daylight saving time rules. TimeZoneInfo is the more powerful of the two and was introduced in Framework 3.5.

The biggest difference between the two types is that TimeZone lets you access only the current local time zone, whereas TimeZoneInfo provides access to all the world’s time zones. Further, TimeZoneInfo exposes a richer (although at times, more awkward) rules-based model for describing daylight saving time.