C#.Net Framewrok:

DateTime.MinValue => 0001/01/01 00:00:00

SqlDateTime.MinValue.Value  => 1753/01/01 00:00:00 

DateTime.MaxValue           => 9999/12/31 23:59:59.999 

SqlDateTime.MaxValue.Value   => 9999/12/31 23:59:59.997

SQL Server 2005:

DateTime 最小值           => 1753/01/01 00:00:00

SmallDateTime 最小值   => 1900/01/01 00:00:00

DateTime 最大值               => 9999/12/31 23:59:59.997 

SmallDateTime 最大值 =>2079.6.6