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

# WithinPastSeconds

Check whether two TDateTimes are only a number of seconds apart

## Declaration

Source position: dateutil.inc line 262

 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

 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 WithinPastHours Check whether two TDateTimes are only a number of hours apart WithinPastMinutes Check whether two TDateTimes are only a number of minutes apart WithinPastMilliSeconds Check whether two TDateTimes 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.