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

WithinPastSeconds

Check whether two datetimes are only a number of seconds apart

Declaration

Source position: dateutil.inc line 247

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

Trueif ANowand Athenare only ASecondsapart, falseotherwise

Description

WithinPastSecondscompares the timestamps ANowand AThenand returns Trueif the difference between them is at most ASecondsseconds apart, or Falseif they are further apart.

Remark: Since this function uses the SecondsBetweenfunction 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.