Документация PHP
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Migrating from PHP 5.0.x to PHP 5.1.x
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:
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The timezone set using the date_default_timezone_set() function (if any)
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The TZ environment variable (if non empty)
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"magical" guess (if the operating system supports it)
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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.