YearsBetween

Calculate the number of whole years between two DateTime values

Declaration

Source position: dateutil.inc line 255

function YearsBetween(

const ANow: TDateTime;

const AThen: TDateTime

):Integer;

Arguments

`ANow`		First moment in time
`AThen`		Second moment in time

Function result

Number of whole years between ANow and AThen.

Description

YearsBetween returns the number of whole years between ANow and AThen. This number is an approximation, based on an average number of days of 365.25 per year (average over 4 years). This means the fractional part of a year is dropped.

MonthsBetween		Calculate the number of whole months between two DateTime values
WeeksBetween		Calculate the number of whole weeks between two DateTime values
DaysBetween		Number of whole days between two DateTime values.
HoursBetween		Calculate the number of whole hours between two DateTime values.
MinutesBetween		Calculate the number of whole minutes between two DateTime values.
SecondsBetween		Calculate the number of whole seconds between two DateTime values.
MilliSecondsBetween		Calculate the number of whole milliseconds between two DateTime values.
YearSpan		Calculate the approximate number of years between two DateTime values.

Example

Program Example55;

{ This program demonstrates the YearsBetween function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

begin
 Write('Number of years between ');
 Write(DateToStr(AThen),' and ',DateToStr(ANow));
 Writeln(' : ',YearsBetween(ANow,AThen));
end;

Var
  D1,D2 : TDateTime;

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