[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.

See also

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.
Documentation generated on: Nov 16 2015