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

# YearsBetween

Calculate the number of whole years between two DateTime values

## Declaration

Source position: dateutil.inc line 256

 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.
```