Reference for package '#rtl'

IsValidDateDay

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

Declaration

Source position: dateutil.inc line 88

  function IsValidDateDay(const AYear: Word; const ADayOfYear: Word)
                          : Boolean;

Description

IsValidDateDay returns True if AYear and ADayOfYear form a valid date indication, or False otherwise.

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

The ADayOfYear value is checked to see whether it falls within the valid range of dates for AYear.

See also

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

Example

Program Example9;
{ This program demonstrates the IsValidDateDay function }
Uses SysUtils,DateUtils;
Var
  Y : Word;
Begin
  For Y:=1996 to 2004 do
    if  IsValidDateDay(Y,366) then
      Writeln(Y,' is a leap year');
End.