Returns the number of whole weeks between two specified TDateTime values.
function WeeksBetween(const ANow: TDateTime; const AThen: TDateTime): Integer;
int WeeksBetween(const TDateTime ANow, const TDateTime AThen);
DateUtils
Call WeeksBetween to obtain the difference, in weeks, between two TDateTime values. WeeksBetween counts only whole Weeks. Thus, WeeksBetween reports the difference between January 1 at 12:00 AM and Jan 6 at 11:58 PM as 0 because the difference is one minute short of an entire week.
MillisecondsBetween
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