/**
* @internal
* @param LocalDate $date
* @return int
*/
public static function getWeekBasedYear(LocalDate $date)
{
$year = $date->getYear();
$doy = $date->getDayOfYear();
if ($doy <= 3) {
$dow = $date->getDayOfWeek()->getValue() - 1;
if ($doy - $dow < -2) {
$year--;
}
} else {
if ($doy >= 363) {
$dow = $date->getDayOfWeek()->getValue() - 1;
$doy = $doy - 363 - ($date->isLeapYear() ? 1 : 0);
if ($doy - $dow >= 0) {
$year++;
}
}
}
return $year;
}