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

YearSpan

Calculate the approximate number of years between two TDateTime values.

Declaration

Source position: dateutil.inc line 284

function YearSpan(

  const ANow: TDateTime;

  const AThen: TDateTime

):Double;

Arguments

ANow

  

First moment in time

AThen

  

Second moment in time

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

MonthSpan

  

Calculate the approximate number of months between two TDateTime values.

WeekSpan

  

Calculate the approximate number of weeks between two TDateTime values.

DaySpan

  

Calculate the approximate number of days between two TDateTime values.

HourSpan

  

Calculate the approximate number of hours between two TDateTime values.

MinuteSpan

  

Calculate the approximate number of minutes between two TDateTime values.

SecondSpan

  

Calculate the approximate number of seconds between two TDateTime values.

MilliSecondSpan

  

Calculate the approximate number of milliseconds between two TDateTime values.

YearsBetween

  

Calculate the number of whole years between two TDateTime values

Example

Program Example63;

{ This program demonstrates the YearSpan function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

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

Documentation generated on: May 14 2021