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日付扱うときの環境設定

PHP​

ini
date.timezone = Asia/Tokyo
php
ini_set('date.timezone', 'Asia/Tokyo'); // or set on php.ini

php.ini か ini_set() でこれを設定しておかないと、こんなエラーが

txt
Exception: DateTime::__construct(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone.Exception: DateTime::__construct(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone.