IsValidDateWeek¶

Check whether a given year/week/day of the week combination is a valid day.

Declaration¶

Source position: dateutil.inc line 112

function IsValidDateWeek(const AYear: Word; const AWeekOfYear: Word; 
                        const ADayOfWeek: Word) : Boolean;

Arguments¶

Name	Description
AYear	Year.
AWeekOfYear	Week in the year.
ADayOfWeek	Day in the week.

Function result¶

True if the given combination is a valid date, False otherwise.

Description¶

IsValidDateWeek returns True if AYear, AWeekOfYear and ADayOfWeek form a valid date indication, or False otherwise.

AYear must be in the range 1..9999 to be valid.

The ADayOfWeek,ADayOfWeek values are checked to see whether the combination falls within the valid range of weeks for AYear.

See also¶

Name	Description
IsValidDate	Check whether a set of values is a valid date indication.
IsValidTime	Check whether a set of values is a valid time indication.
IsValidDateTime	Check whether a set of values is a valid date and time indication.
IsValidDateDay	Check whether a given year/day of year combination is a valid date.
IsValidDateMonthWeek	Check whether a given year/month/week/day of the week combination is a valid day.

Example¶

Program Example10;

{ This program demonstrates the IsValidDateWeek function }

Uses SysUtils,DateUtils;

Var
  Y,W,D : Word;
  B : Boolean;

Begin
  For Y:=2000 to 2004 do
    begin
    B:=True;
    For W:=51 to 54 do
      For D:=1 to 7 do
        If B then
          begin
          B:=IsValidDateWeek(Y,W,D);
          If Not B then
            if (D=1) then
              Writeln(Y,' has exactly ',W,' weeks.')
            else
              Writeln(Y,' has ',W,' weeks and ',D-1,' days.');
          end;
    end;
End.