Having said the above, and believing it's a duplicate, I would still strongly suggest you understanding what you are facing.
DateTime & databases don't really mix well. They do in the sense that you can put a DateTime object in a database, but they don't in the sense that a time is not a precise representation.
I would highly recommend having a look at this video that tackles the problem in 10 minutes.
This is also why Jon Skeet wrote his Noda Time , because we humans, have a very fickle sense of time, and if that's not enough, the universe and it's laws have an even more funny sense of what it is (which leads us to keep changing and bending time to work the way we want).