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

# WithinPastDays

Check whether two datetimes are only a number of days apart

## Declaration

Source position: dateutil.inc line 246

`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 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.

Documentation generated on: Feb 26 2014