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

# WithinPastHours

Check whether two TDateTimes are only a number of hours apart

## Declaration

Source position: dateutil.inc line 260

 function WithinPastHours( const ANow: TDateTime; const AThen: TDateTime; const AHours: Int64 ):Boolean;

## Arguments

 ANow First moment in time AThen Second moment in time AHours Number of hours to check

## Function result

True if ANow and Athen are only AHours apart, false otherwise

## Description

WithinPastHours compares the timestamps ANow and AThen and returns True if the difference between them is at most AHours hours apart, or False if they are further apart.

 Remark: Since this function uses the HoursBetween function to calculate the difference in Hours, this means that fractional hours do not count, and the fractional part is simply dropped, so for two dates actually 2 and a half hours apart, the result will also be True

 WithinPastYears Check whether two TDateTimes are only a number of years apart WithinPastMonths Check whether two TDateTimes are only a number of months apart WithinPastWeeks Check whether two TDateTimes are only a number of weeks apart WithinPastDays Check whether two TDateTimes are only a number of days apart WithinPastMinutes Check whether two TDateTimes are only a number of minutes apart WithinPastSeconds Check whether two TDateTimes are only a number of seconds apart WithinPastMilliSeconds Check whether two TDateTimes are only a number of milliseconds apart

## Example

```Program Example51;

{ This program demonstrates the WithinPastHours function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime; AHours : Integer);

begin
Write(DateTimeToStr(AThen),' and ',DateTimeToStr(ANow));
Write(' are within ',AHours,' hours: ');
Writeln(WithinPastHours(ANow,AThen,AHours));
end;

Var
D1,D2 : TDateTime;

Begin
D1:=Now;
D2:=D1-(59*OneMinute);
Test(D1,D2,1);
D2:=D1-(61*OneMinute);
Test(D1,D2,1);
D2:=D1-(122*OneMinute);
Test(D1,D2,1);
D2:=D1-(306*OneMinute);
Test(D1,D2,5);
D2:=D1-(5.4*OneHour);
Test(D1,D2,5);
D2:=D1-(2.5*OneHour);
Test(D1,D2,1);
Test(D1,D2,2);
Test(D1,D2,3);
End.
```