FPDoc Onlineexperiment

DaysBetween function

In unit DateUtils

Number of whole days between two TDateTime values.

Declaration

pascal

function DaysBetween(const ANow: TDateTime; const AThen: TDateTime)
: Integer

Arguments

`ANow`	First date.
`AThen`	Second date.

Function result

Number of whole days between ANow and AThen.

Description

DaysBetween returns the number of whole days between ANow and AThen. This means the fractional part of a day (hours, minutes, etc.) is dropped.

See also

Example: `ex58`

pascal

Program Example58;

{ This program demonstrates the DaysBetween function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

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