WeekSpan

Calculate the approximate number of weeks between two DateTime values.

Declaration

Source position: dateutil.inc line 271

function WeekSpan(

const ANow: TDateTime;

const AThen: TDateTime

):Double;

Arguments

`ANow`		First moment in time
`AThen`		Second moment in time

Function result

Number (fractions included) of weeks between ANow and AThen

Description

WeekSpan returns the number of weeks between ANow and AThen, including any fractional parts of a week.

YearSpan		Calculate the approximate number of years between two DateTime values.
MonthSpan		Calculate the approximate number of months between two DateTime values.
DaySpan		Calculate the approximate number of days 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.
WeeksBetween		Calculate the number of whole weeks between two DateTime values

Example

Program Example57;

{ This program demonstrates the WeekSpan function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

begin
 Write('Number of weeks between ');
 Write(DateToStr(AThen),' and ',DateToStr(ANow));
 Writeln(' : ',WeekSpan(ANow,AThen));
end;

Var
  D1,D2 : TDateTime;

Begin
  D1:=Today;
  D2:=Today-7;
  Test(D1,D2);
  D2:=Today-8;
  Test(D1,D2);
  D2:=Today-14;
  Test(D1,D2);
  D2:=Today-35;
  Test(D1,D2);
  D2:=Today-36;
  Test(D1,D2);
  D2:=Today-17;
  Test(D1,D2);
End.