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

HourSpan

Calculate the approximate number of hours between two DateTime values.

Declaration

Source position: dateutil.inc line 275

 function HourSpan( const ANow: TDateTime; const AThen: TDateTime ):Double;

Arguments

 ANow First moment in time AThen Second moment in time

Function result

Number (fractions included) of hours between ANow and AThen

Description

HourSpan returns the number of Hours between ANow and AThen, including any fractional parts of a Hour.

 YearSpan Calculate the approximate number of years between two DateTime values. MonthSpan Calculate the approximate number of months between two DateTime values. WeekSpan Calculate the approximate number of weeks between two DateTime values. DaySpan Calculate the approximate number of days between two DateTime values. MinuteSpan Calculate the approximate number of minutes between two DateTime values. SecondSpan Calculate the approximate number of seconds between two DateTime values. MilliSecondSpan Calculate the approximate number of milliseconds between two DateTime values. HoursBetween Calculate the number of whole hours between two DateTime values.

Example

```Program Example67;

{ This program demonstrates the HourSpan function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

begin
Write('Number of hours between ');
Write(DateTimeToStr(AThen),' and ',DateTimeToStr(ANow));
Writeln(' : ',HourSpan(ANow,AThen));
end;

Var
D1,D2 : TDateTime;

Begin
D1:=Now;
D2:=D1-(59*OneMinute);
Test(D1,D2);
D2:=D1-(61*OneMinute);
Test(D1,D2);
D2:=D1-(122*OneMinute);
Test(D1,D2);
D2:=D1-(306*OneMinute);
Test(D1,D2);
D2:=D1-(5.4*OneHour);
Test(D1,D2);
D2:=D1-(2.5*OneHour);
Test(D1,D2);
End.
```