FPDoc Onlineexperiment

HourSpan function

In unit DateUtils

Calculate the approximate number of hours between two TDateTime values.

Declaration

pascal

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.

See also

Example: `ex67`

pascal

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.

An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.