TimeZone 

TimeZone shows up to twelve time zones relative to your local time. The time zone displays are customizable to the hour and minute offset necessary.
time zone clock offset timezone gmt st dt

Time Sync Pro 

Time Sync Pro is an application that connects to one of the many atomic clock web servers, downloads the time to your PC and adjusts it. Time Sync Pro has many features including the automatic adjustment of your computer clock.
time sync synchronize synchronization timesync gmt nist atomic clock clock date world zone adjust synchronize

Time Zone Map 

Provides local time and date for locations worldwide with accurate adjustments for daylight savings time. Runs on your laptop or desktop and lists locations by the City name for easy lookup.
world time zone map zones daylight savings gmt globe global timezone