I have an administrative form for shared content that displays the option to adjust the timezones for the displayed content.

Currently, in the admin form it calls system_time_zones() for the options in the form. It works fine, I just want to replace:

America/Los Angeles: Monday, October 21, 2013 - 09:13 - 0700


America/Los Angeles

Any thoughts? Is it just as simple as a hook or form field alter?