function DaysBetween ( const ToDate, FromDate : TDateTime ) : Integer;
Description
The DaysBetween function subtracts the FromDate from the ToDate, returning the number whole days difference.
The time value of each date is taken account of - only whole 24 hour chunks are counted as whole days.
Notes
A whole day does not have to start at 00:00:00.
Related commands
DaysInAMonth Gives the number of days in a month
DaysInAYear Gives the number of days in a year
DaySpan Gives the fractional number of days between 2 dates
Example code : Find the days difference between two date+time values.
var
fromdate, toDate : TDateTime;
begin
// Set up our date variables
fromDate := EncodeDateTime(2000, 02, 26, 10, 0, 0, 0);
toDate := EncodeDateTime(2000, 02, 29, 9, 0, 0, 0);
// Display these dates and the days between them
ShowMessage('From date = '+DateTimeToStr(fromDate));
ShowMessage('To date = '+DateTimeToStr(toDate));
ShowMessage('Whole days difference = '+
IntToStr(DaysBetween(toDate, fromDate))+' days');
end;
Show full unit code
From date = 26/02/2000 10:00:00
To date = 29/02/2000 09:00:00
Whole days difference = 2 days