WithinPastSeconds

Check whether two TDateTimes 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;

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

Name	Description
WithinPastDays	Check whether two TDateTimes are only a number of days apart
WithinPastHours	Check whether two TDateTimes are only a number of hours apart
WithinPastMilliSeconds	Check whether two TDateTimes are only a number of milliseconds apart
WithinPastMinutes	Check whether two TDateTimes are only a number of minutes 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
WithinPastYears	Check whether two TDateTimes are only a number of years 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.