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

# SecondsBetween

Calculate the number of whole seconds between two DateTime values.

## Declaration

Source position: dateutil.inc line 262

 function SecondsBetween( const ANow: TDateTime; const AThen: TDateTime ):Int64;

## Arguments

 ANow First moment in time AThen Second moment in time

## Function result

Number of seconds between ANow and AThen

## Description

SecondsBetween returns the number of whole seconds between ANow and AThen. This means the fractional part of a second (milliseconds etc.) is dropped.

 YearsBetween Calculate the number of whole years between two DateTime values 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. MilliSecondsBetween Calculate the number of whole milliseconds between two DateTime values.

## Example

```Program Example61;

{ This program demonstrates the SecondsBetween function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

begin
Write('Number of seconds between ');
Write(TimeToStr(AThen),' and ',TimeToStr(ANow));
Writeln(' : ',SecondsBetween(ANow,AThen));
end;

Var
D1,D2 : TDateTime;

Begin
D1:=Now;
D2:=D1-(999*OneMilliSecond);
Test(D1,D2);
D2:=D1-(1001*OneMilliSecond);
Test(D1,D2);
D2:=D1-(2001*OneMilliSecond);
Test(D1,D2);
D2:=D1-(5001*OneMilliSecond);
Test(D1,D2);
D2:=D1-(5.4*OneSecond);
Test(D1,D2);
D2:=D1-(2.5*OneSecond);
Test(D1,D2);
End.
```