<?php
$fmt = datefmt_create( "en_US" ,IntlDateFormatter::FULL,IntlDateFormatter::FULL,'America/Los_Angeles',IntlDateFormatter::GREGORIAN );
echo "calendar of the formatter is : ".datefmt_get_calendar($fmt);
datefmt_set_calendar($fmt,IntlDateFormatter::TRADITIONAL);
echo "Now calendar of the formatter is : ".datefmt_get_calendar($fmt);
?>