Wiktionary
synchronized clock
n. (context military English) A technique of timing the delivery of fires by placing all units on a common time. The synchronized clock uses a specific hour and minute based on either local or universal time. local time is established using the local time zone.
Usage examples of "synchronized clock".
Grote Slankard, most-wanted criminal on the FBI roster north of the border, was probably watching the second hand of a synchronized clock right this moment, too.