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

# WithinPastSeconds

Check whether two datetimes are only a number of seconds apart

## Declaration

Source position: dateutil.inc line 249

`function WithinPastSeconds(`
`const ANow: TDateTime;`
`const AThen: TDateTime;`
`const ASeconds: Int64`
`):Boolean;`

## Arguments

`ANow` |  | First moment in time
`AThen` |  | Second moment in time
`ASeconds` |  | Number of seconds to check

## Function result

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

## Description

WithinPastSeconds compares the timestamps ANow and AThen and returns True if the difference between them is at most ASeconds seconds apart, or False if they are further apart.

Remark: | Since this function uses the SecondsBetween function to calculate the difference in seconds, this means that fractional seconds do not count, and the fractional part is simply dropped, so for two dates actually 2 and a half seconds 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
WithinPastHours |  | Check whether two datetimes are only a number of hours apart
WithinPastMinutes |  | Check whether two datetimes are only a number of minutes apart
WithinPastMilliSeconds |  | Check whether two datetimes are only a number of milliseconds apart

## Example

    Program Example53;

    { This program demonstrates the WithinPastSeconds function }

    Uses SysUtils,DateUtils;

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

    begin
     Write(DateTimeToStr(AThen),' and ',DateTimeToStr(ANow));
     Write(' are within ',ASeconds,' seconds: ');
     Writeln(WithinPastSeconds(ANow,AThen,ASeconds));
    end;

    Var
      D1,D2 : TDateTime;

    Begin
      D1:=Now;
      D2:=D1-(999*OneMilliSecond);
      Test(D1,D2,1);
      D2:=D1-(1001*OneMilliSecond);
      Test(D1,D2,1);
      D2:=D1-(2001*OneMilliSecond);
      Test(D1,D2,1);
      D2:=D1-(5001*OneMilliSecond);
      Test(D1,D2,5);
      D2:=D1-(5.4*OneSecond);
      Test(D1,D2,5);
      D2:=D1-(2.5*OneSecond);
      Test(D1,D2,1);
      Test(D1,D2,2);
      Test(D1,D2,3);
    End.

Documentation generated on: Feb 26 2014