1)   1st Clock 4.0
See the date as well as the time in the tray clock in a way you want. Monitor PC performance. Show the calendar in one click. Never miss important events with reliable alarms! Keep an exact clock with atomic time. View the time in other time zones.
date, alarms, atomic time, time zones, calendar, system clock, taskbar clock, tclock, tclockex, tray clock,

 2)   ZoneTick 2.7.0
The ZoneTick download replaces Windows system clock with a multiple time zone clock, utilizing skins, alarms, and double-click actions for each timezone. A taskbar utility for anyone traveling or doing business overseas. Auto-daylight saving shift.
clock, clocks, time, time zone, time zones, timezone, taskbar clock, system clock, international time, world time,

 3)   Clock Guard 2.0.0
Software program that prevents tampering with (changing) the computer clock
system clock, computer clock, set, reset, tamper, protect, restrict,