php-bugs@gentoo.org PHP This extension is a drop-in replacement for the builtin timezone database that comes with PHP. You should only install this extension in case you need to get a later version of the timezone database than the one that ships with PHP. The data that this extension uses comes from the "Olson" database, which is located at ftp://elsie.nci.nih.gov/pub/. php/pecl-datetime-timezonedb