WordPress’te herhangi bir yerde şöyle bir hata ile karşılaşıyorsanız:

Warning: date() [function.date]: 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 ‘Europe/Helsinki’ for ‘EEST/3.0/DST’ instead in wp-includes/functions.php on line 43

bunu çözmek için wp-includes/functions.php dosyasını açın ve ilk fonsiyondan önce şu kodu yapıştırın:

date_default_timezone_set('UTC');

In WordPress, if you got a warning message in anywhere:

Warning: date() [function.date]: 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 ‘Europe/Helsinki’ for ‘EEST/3.0/DST’ instead in wp-includes/functions.php on line 43

you should add below in wp-includes/functions.php file before the first function:

date_default_timezone_set('UTC');