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In the below thisIsAlwaysTrue should always be true.
DateTime d = DateTime.Now;
bool thisIsAlwaysTrue = d == d;
But does DateTime.Now work in such a way that isThisAlwaysTrue is guaranteed to be true? Or can the clock change between references to the Now property?
bool isThisAlwaysTrue = DateTime.Now == DateTime.Now;
The clock can definitely change between two back-to-back calls to DateTime.Now;