正如 MPelletier 提到的:您需要两对 DateTimes:
var start1 = new DateTime(2013, 4, 10).Ticks;
var end1 = new DateTime(2013, 4, 20).Ticks;
var start2 = new DateTime(2013, 4, 9).Ticks;
var end2 = new DateTime(2013, 4, 11).Ticks;
if (start2 < end1)
{
//// Overlapping
}