FPDoc Onlineexperiment

DaySpan function

In unit DateUtils

Calculate the approximate number of days between two TDateTime values.

Declaration

pascal

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

Arguments

`ANow`	First moment in time.
`AThen`	Second moment in time.

Function result

Number (fractions included) of days between ANow and AThen.

Description

DaySpan returns the number of Days between ANow and AThen, including any fractional parts of a Day.

See also

Example: `ex66`

pascal

Program Example66;

{ This program demonstrates the DaySpan function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

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

Var
  D1,D2 : TDateTime;

Begin
  D1:=Now;
  D2:=Today-23/24;
  Test(D1,D2);
  D2:=Today-1;
  Test(D1,D2);
  D2:=Today-25/24;
  Test(D1,D2);
  D2:=Today-26/24;
  Test(D1,D2);
  D2:=Today-5.4;
  Test(D1,D2);
  D2:=Today-2.5;
  Test(D1,D2);
End.

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