WithinPastDays

Check whether two datetimes are only a number of days apart

Declaration

Source position: dateutil.inc line 245

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

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

Description

WithinPastDays compares the timestamps ANow and AThen and returns True if the difference between them is at most ADays days apart, or False if they are further apart.

Remark:

Since this function uses the DaysBetween function 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

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.