[Overview][Constants][Procedures and functions][Index] Reference for unit 'dateutils' (#rtl)

DaySpan

Calculate the approximate number of days between two DateTime values.

Declaration

Source position: dateutil.inc line 274

 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.

 YearSpan Calculate the approximate number of years between two DateTime values. MonthSpan Calculate the approximate number of months between two DateTime values. WeekSpan Calculate the approximate number of weeks between two DateTime values. HourSpan Calculate the approximate number of hours between two DateTime values. MinuteSpan Calculate the approximate number of minutes between two DateTime values. SecondSpan Calculate the approximate number of seconds between two DateTime values. MilliSecondSpan Calculate the approximate number of milliseconds between two DateTime values. DaysBetween Number of whole days between two DateTime values.

Example

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.