WithinPastYears¶

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

Declaration¶

Source position: dateutil.inc line 266

function WithinPastYears(const ANow: TDateTime; const AThen: TDateTime; 
                        const AYears: Integer) : Boolean;

Arguments¶

Name	Description
ANow	First moment in time.
AThen	Second moment in time.
AYears	Number of years to check.

Function result¶

True if ANow and Athen are only AYears apart, false otherwise.

Description¶

WithinPastYears compares the timestamps ANow and AThen and returns True if the difference between them is at most AYears years apart, or False if they are further apart.

Remark:

Since this function uses the YearsBetween function to calculate the difference in years, this means that fractional years do not count, and the fractional part is simply dropped, so for two dates actually 2 and a half years apart, the result will also be True

See also¶

Name	Description
WithinPastMonths	Check whether two TDateTimes are only a number of months apart.
WithinPastWeeks	Check whether two TDateTimes are only a number of weeks apart.
WithinPastDays	Check whether two TDateTimes are only a number of days 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 Example47;

{ This program demonstrates the WithinPastYears function }

Uses SysUtils,DateUtils;

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

begin
 Write(DateToStr(AThen),' and ',DateToStr(ANow));
 Write(' are within ',AYears,' years: ');
 Writeln(WithinPastYears(ANow,AThen,AYears));
end;

Var
  D1,D2 : TDateTime;

Begin
  D1:=Today;
  D2:=Today-364;
  Test(D1,D2,1);
  D2:=Today-365;
  Test(D1,D2,1);
  D2:=Today-366;
  Test(D1,D2,1);
  D2:=Today-390;
  Test(D1,D2,1);
  D2:=Today-368;
  Test(D1,D2,1);
  D2:=Today-1000;
  Test(D1,D2,1);
  Test(D1,D2,2);
  Test(D1,D2,3);
End.