Warning: Use of undefined constant year - assumed 'year' (this will throw an Error in a future version of PHP) in /home/jeanluc/www/chie/zaitaku/php/study/date/time_2.php on line 11

Warning: Use of undefined constant mon - assumed 'mon' (this will throw an Error in a future version of PHP) in /home/jeanluc/www/chie/zaitaku/php/study/date/time_2.php on line 12

Warning: Use of undefined constant mday - assumed 'mday' (this will throw an Error in a future version of PHP) in /home/jeanluc/www/chie/zaitaku/php/study/date/time_2.php on line 13
2025 年 4 月 29 日 の 30 日後 →　2025/05/29