Date () error problem in PHP file running on Mac

Learn PHP This technology, I am a novice, stepping on a hole, here to record:

Warning:date (): It is not safe for rely on the system ' s timezone settings. You is *required* to use the Date.timezone setting or the Date_default_timezone_set () function. In case you used any of those methods and you is still getting this warning, your most likely misspelled the timezone Iden Tifier. We selected the timezone ' UTC ' for now, but please set Date.timezone to select your timezone. In/users/libolin/sites/www/mes/php/mes.php on line 7

It isn't safe to rely on the system ' s timezone settings

It probably says the time zone is wrong, and then try to add it to the text header  : Ini_set (' Date.timezone ', ' Asia/shanghai '); The problem has been solved

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Date () error problem in PHP file running on Mac