Reference for package '#rtl'

DaysBetween

Number of whole days between two TDateTime values.

Declaration

Source position: dateutil.inc line 259

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

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