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

WithinPastDays

Check whether two TDateTimes are only a number of days apart

Declaration

Source position: dateutil.inc line 259

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

See also

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.

Documentation generated on: May 14 2021