Introduces Textpattern_Date_Timezone::getIdentifier().

Allows extracting information about single timezone
identifier.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5662 2fea6a4d-a838-0410-917b-93a53c48e9d2
Returns FALSE, document params.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5663 2fea6a4d-a838-0410-917b-93a53c48e9d2
Daylight

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5664 2fea6a4d-a838-0410-917b-93a53c48e9d2