Fatal error: Uncaught TypeError: mktime(): Argument #1 ($hour) must be of type int, string given in /var/www/vhosts/en.lib-arts.hc.keio.ac.jp/public_html/event_list.php:247 Stack trace: #0 /var/www/vhosts/en.lib-arts.hc.keio.ac.jp/public_html/event_list.php(247): mktime() #1 {main} thrown in /var/www/vhosts/en.lib-arts.hc.keio.ac.jp/public_html/event_list.php on line 247