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

WithinPastDays

Check whether two datetimes are only a number of days apart

Declaration

Source position: dateutil.inc line 244

function WithinPastDays(

  const ANow: TDateTime;

  const AThen: TDateTime;

  const ADays: Integer

):Boolean;

Arguments

ANow

  

First moment in time

AThen

  

Second moment in time

ADays

  

Number of days to check

Function result

Trueif ANowand Athenare only ADaysapart, falseotherwise

Description

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

Remark: Since this function uses the DaysBetweenfunction to calculate the difference in days, this means that fractional days do not count, and the fractional part is simply dropped, so for two dates actually 2 and a half days 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

WithinPastHours

  

Check whether two datetimes are only a number of hours 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 Example50;

{ This program demonstrates the WithinPastDays function }

Uses SysUtils,DateUtils;

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

begin
 Write(DateTimeToStr(AThen),' and ',DateTimeToStr(ANow));
 Write(' are within ',ADays,' days: ');
 Writeln(WithinPastDays(ANow,AThen,ADays));
end;

Var
  D1,D2 : TDateTime;

Begin
  D1:=Now;
  D2:=Today-23/24;
  Test(D1,D2,1);
  D2:=Today-1;
  Test(D1,D2,1);
  D2:=Today-25/24;
  Test(D1,D2,1);
  D2:=Today-26/24;
  Test(D1,D2,5);
  D2:=Today-5.4;
  Test(D1,D2,5);
  D2:=Today-2.5;
  Test(D1,D2,1);
  Test(D1,D2,2);
  Test(D1,D2,3);
End.