Migration51/datetime-Phpdoc专题

Date/time support

Date/time support has been fully rewritten in PHP 5.1.x, and no longer uses the system settings to 'know' the timezone in operation. It will instead utilize, in the following order:

• The timezone set using the <span class="function">date_default_timezone_set function (if any)

• The TZ environment variable (if non empty)

• "magical" guess (if the operating system supports it)

• If none of the above options succeeds, UTC

To ensure accuracy (and avoid an E_STRICT warning), you will need to define your timezone in your php.ini using the following format:

date.timezone = Europe/London

The supported timezones are listed, in this format, in the timezones appendix.

Also note that strtotime now returns false on failure, instead of -1.