YearSpan

Calculate the approximate number of years between two TDateTime values.

Declaration

Source position: dateutil.inc line 293

Arguments

Function result

Number (fractions included) of years between ANow and AThen.

Description

YearSpan returns the number of years between ANow and AThen, including any fractional parts of a year. This number is an approximation, based on an average number of days of 365.25 per year (average over 4 years).

See also

Example

Program Example63;

{ This program demonstrates the YearSpan function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,ThenDateTime);

begin
 Write('Number of years between ');
 Write(DateToStr(Thenand ',DateToStr(ANow));
 Writeln(' : ',YearSpan(ANow,ThenStr(ANow));
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.