Delphi Basics : DaysBetween command

DelphiBasics

DaysBetween
Function

Gives the whole number of days between 2 dates

DateUtils unit

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

Download this web site as a Windows program.

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