jaredatch/Custom-Metaboxes-and-Fields-for-WordPress — pull request #338 by dessibelle (2013-08-27 15:37:29+00:00)
Title: Added a datetime combo with support for time zones and a stand alone time zone drop down

I have added the `text_datetime_timestamp_timezone` and the `select_timezone` fields, which lets you store datetime time info with respect to a timezone, as well as a single time zone name, which can be useful if your metabox holds multiple datetime fields and you do not wish to assign different time zones to them.