/**
* Return true if the given year is a leap year. Determination of whether a
* year is a leap year is actually very complicated. We do something crude
* and mostly correct here, but for a real determination you need a lot of
* contextual information. For example, in Sweden, the change from Julian to
* Gregorian happened in a complex way resulting in missed leap years and
* double leap years between 1700 and 1753. Another example is that after the
* start of the Julian calendar in 45 B.C., the leap years did not regularize
* until 8 A.D. This method ignores these quirks, and pays attention only to
* the Julian onset date and the Gregorian cutover (which can be changed).
*
* @param int The given year.
*
* @return bool if the given year is a leap year; false otherwise.
*
* @author Dominik del Bondio <*****@*****.**>
* @author The ICU Project
* @since 0.11.0
*/
public function isLeapYear($year)
{
// MSVC complains bitterly if we try to use Grego::isLeapYear here
// NOTE: year&0x3 == year%4
return $year >= $this->fGregorianCutoverYear ? AgaviCalendarGrego::isLeapYear($year) : ($year & 0x3) == 0;
// Julian
}
