Returns the number of whole days between two specified TDateTime values.
function DaysBetween(const ANow: TDateTime; const AThen: TDateTime): Integer;
int DaysBetween(const TDateTime ANow, const TDateTime AThen);
DateUtils
Call DaysBetween to obtain the difference, in days, between two TDateTime values.
DaysBetween counts only whole days. Thus, DaysBetween reports the difference between Dec 31, 1999 11:59 PM and Jan 1, 2000 11:58 PM as 0 because the difference is one minute short of an entire day.
MillisecondsBetween
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