Reference for package '#rtl'

WeekSpan

Calculate the approximate number of weeks between two TDateTime values.

Declaration

Source position: dateutil.inc line 273

  function WeekSpan(const ANow: TDateTime; const AThen: TDateTime)
                    : Double;

Description

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

See also

Name Description
DaySpan Calculate the approximate number of days between two TDateTime values.
HourSpan Calculate the approximate number of hours between two TDateTime values.
MilliSecondSpan Calculate the approximate number of milliseconds between two TDateTime values.
MinuteSpan Calculate the approximate number of minutes between two TDateTime values.
MonthSpan Calculate the approximate number of months between two TDateTime values.
SecondSpan Calculate the approximate number of seconds between two TDateTime values.
WeeksBetween Calculate the number of whole weeks between two TDateTime values
YearSpan Calculate the approximate number of years between two TDateTime 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.