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

# DaysBetween

Number of whole days between two TDateTime values.

## Declaration

Source position: dateutil.inc line 272

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