(PHP 5 >= 5.5.0, PHP 7, PHP 8)
$timeZoneOrYear,$localeOrMonth,$dayOfMonth,$hour,$minute,$second = ?$year,$month,$dayOfMonth,$hour,$minute,$second = null$timezone = null, ?string $locale = null): ?IntlCalendar$datetime, ?string $locale = null): ?IntlCalendar$keyword, string $locale, bool $onlyCommon): IntlIterator|false$year,$month,$dayOfMonth = NULL,$hour = NULL,$minute = NULL,$second = NULL