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

# HoursBetween

Calculate the number of whole hours between two DateTime values.

## Declaration

Source position: dateutil.inc line 260

 function HoursBetween( const ANow: TDateTime; const AThen: TDateTime ):Int64;

## Arguments

 ANow First DateTime value AThen Second DateTime value

## Function result

Number of hours between ANow and AThen

## Description

HoursBetween returns the number of whole hours between ANow and AThen. This means the fractional part of an hour (minutes,seconds 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 DaysBetween Number of whole days 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 Example59;

{ This program demonstrates the HoursBetween function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

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

Var
D1,D2 : TDateTime;

Begin
D1:=Now;
D2:=D1-(59*OneMinute);
Test(D1,D2);
D2:=D1-(61*OneMinute);
Test(D1,D2);
D2:=D1-(122*OneMinute);
Test(D1,D2);
D2:=D1-(306*OneMinute);
Test(D1,D2);
D2:=D1-(5.4*OneHour);
Test(D1,D2);
D2:=D1-(2.5*OneHour);
Test(D1,D2);
End.
```