This plugin will display the time in the four cities and place these times in your footer.
A simple Timezone widget and shortcode that allows you to convert time differences and easily plan events or meetings based in other timezones.
Set a timezone just for this post. Code is untested and a little messy, written in a couple of hours in response to a request.
Allows users to set-up their local time zone on the profile page and view their local time on the website's frontend.