[Overview][Constants][Procedures and functions][Index] Reference for unit 'dateutils' (#rtl)

# DaysBetween

Number of whole days between two DateTime values.

## Declaration

Source position: dateutil.inc line 259

 function DaysBetween( const ANow: TDateTime; const AThen: TDateTime ):Integer;

## Arguments

 ANow First date AThen Second date

## Function result

Number of whole days between ANow and AThen.

## Description

DaysBetween returns the number of whole days between ANow and AThen. This means the fractional part of a day (hours, minutes, etc.) is dropped.

 YearsBetween Calculate the number of whole years between two DateTime values MonthsBetween Calculate the number of whole months between two DateTime values WeeksBetween Calculate the number of whole weeks between two DateTime values HoursBetween Calculate the number of whole hours between two DateTime values. MinutesBetween Calculate the number of whole minutes between two DateTime values. SecondsBetween Calculate the number of whole seconds between two DateTime values. MilliSecondsBetween Calculate the number of whole milliseconds between two DateTime values.

## Example

Program Example58;

{ This program demonstrates the DaysBetween function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

begin
Write('Number of days between ');
Write(DateTimeToStr(AThen),' and ',DateTimeToStr(ANow));
Writeln(' : ',DaysBetween(ANow,AThen));
end;

Var
D1,D2 : TDateTime;

Begin
D1:=Now;
D2:=Today-23/24;
Test(D1,D2);
D2:=Today-1;
Test(D1,D2);
D2:=Today-25/24;
Test(D1,D2);
D2:=Today-26/24;
Test(D1,D2);
D2:=Today-5.4;
Test(D1,D2);
D2:=Today-2.5;
Test(D1,D2);
End.