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

# HoursBetween

Calculate the number of whole hours between two TDateTime values.

## Declaration

Source position: dateutil.inc line 273

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

## Arguments

 ANow First TDateTime value AThen Second TDateTime 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 TDateTime values MonthsBetween Calculate the number of whole months between two TDateTime values WeeksBetween Calculate the number of whole weeks between two TDateTime values DaysBetween Number of whole days 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 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.
```