DaysBetween

Number of whole days between two DateTime values.

Declaration

Source position: dateutil.inc line 258

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.

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
HoursBetween		Calculate the number of whole hours between two DateTime values.
MinutesBetween		Calculate the number of whole minutes between two DateTime values.
SecondsBetween		Calculate the number of whole seconds between two DateTime values.
MilliSecondsBetween		Calculate the number of whole milliseconds between two DateTime values.

Example

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.