This is a new module that you can add to your Delphi libraries
(LIB\Dates.dcu and Source\VCL\Dates.pas), that will let you perform
arithmetic with dates.
New functions added to the VCL:
DayDiff - difference in days between two dates
HourDiff -
difference in hours between two dates
MinuteDiff - difference in
minutes betweeen two dates
SecondDiff - difference in seconds
between two dates
MillisecondDiff - difference in milliseconds
between two dates.
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