DaySpan

Calculate the approximate number of days between two DateTime values.

Declaration

Source position: dateutil.inc line 272

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.