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

# WithinPastHours

Check whether two datetimes are only a number of hours apart

## Declaration

Source position: dateutil.inc line 247

`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

## See also

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

Documentation generated on: Feb 26 2014