Guessing User's TimeZone in PHP

Question

As of PHP5.3 (I think) it became a requirement for the date.timezone to be set in the php.ini file, or to be set at runtime via the date_default_ti

Answer 1

I'd probably use the date_default_timezone_get() function:

string date_default_timezone_get  ( void  )

In order of preference, this function returns the default timezone by:

• Reading the timezone set using the date_default_timezone_set() function (if any)
• Reading the TZ environment variable (if non empty) (Prior to PHP 5.3.0)
• Reading the value of the date.timezone ini option (if set)
• Querying the host operating system (if supported and allowed by the OS)

http://www.php.net/manual/en/function.date-default-timezone-get.php