问题
I've just got a new computer, and I've been setting up PHP/MySQL/databases etc... I think I'm just about there, except it's thrown this curveball. My login script was working fine, but now it's spitting the following warning (which messes up the JSON).
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 'Antarctica/Macquarie' for 'EST/10.0/no DST' instead in .../php/login.php on line 47
My code obviously uses date() and is working in the live version and on the old machine. I get two warnings for the following two lines of code:
$date = date("ymd");
$this_year = date("y");
My research (see here) suggests that the behaviour of these functions depends on php.ini .
So should I change php.ini on the new machine, or am I using some kind of deprecated method, and should I ditch date() altogether?
Thanks.
回答1:
You don't need to change the php.ini file if you use date_default_timezone_set(). Just set it to the timezone you will be working in.
Something like this should go in a config file or on the page where you're working with dates (if it is only one page):
date_default_timezone_set('America/Los_Angeles');
回答2:
It's not an exception, it's a warning that is probably popping up now because your error reporting settings on the new machine are different from the old one.
I would suggest to follow the suggestion in the warning, and use date_default_timezone_set() to set a time-zone in the scripts where you need it.
回答3:
First, you are although it may know, this solves the problem.
date_default_timezone_set('Your/Timezone');
If you want to configure in php.ini, modify below
[Date]
; ...
; ...
date.timezone = Your/Timezone
回答4:
You do not have to change the php.ini.
However, if you have a timezone which you will use for most of your your php files adding the following line to your php.ini should do the trick.
date.timezone = "Your/Timezone"
In my case I added the following line to php.ini. Personally, I prefer to keep all our servers at UTC timezone.
date.timezone = "UTC"
来源：https://stackoverflow.com/questions/10308315/php-date-vs-date-timezone-date-default-timezone-set