Dealing with Dates and Time is a complex issue in IT world. Correctly handling date and time information requires considering the nature of what we are storing as time information and how to apply it to a specific location. This includes calendars, time zone information, daylight-savings periods, and offsets for comparison of different values.
Below are some good references on this topic.
The best overall article is the one from W3C. I would consider it a must-read if you have anything to do with DateTime information.
Stack Exchange sources:
MSDN sources:
Other articles
Reference on how to transfer to and from UTC (link).