WithinPastDays¶

Check whether two TDateTimes are only a number of days apart.

Declaration¶

Source position: dateutil.inc line 269

function WithinPastDays(const ANow: TDateTime; const AThen: TDateTime; 
                       const ADays: Integer) : Boolean;

Arguments¶

Name	Description
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

See also¶

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