DaysBetween¶

Number of whole days between two TDateTime values.

Declaration¶

Source position: dateutil.inc line 282

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

Arguments¶

Name	Description
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¶

Name	Description
YearsBetween	Calculate the number of whole years between two TDateTime values.
MonthsBetween	Calculate the number of whole months between two TDateTime values.
WeeksBetween	Calculate the number of whole weeks between two TDateTime values.
HoursBetween	Calculate the number of whole hours between two TDateTime values.
MinutesBetween	Calculate the number of whole minutes between two TDateTime values.
SecondsBetween	Calculate the number of whole seconds between two TDateTime values.
MilliSecondsBetween	Calculate the number of whole milliseconds between two TDateTime 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.