(PHP 5 >= 5.5.0, PHP 7)
IntlGregorianCalendar::getGregorianChange — Get the Gregorian Calendar change date
public IntlGregorianCalendar::getGregorianChange ( ) : float|false
This function is currently not documented; only its argument list is available.
This function has no parameters.
Returns the change date or false on failure.
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https://www.php.net/manual/en/intlgregoriancalendar.getgregorianchange.php