UTC is coordinated universal time. [ 24-hour system
]
Abbreviated as "Z" Zulu.
Short-wave broadcasters, Listeners,
Hams around the world use the UTC time
format in their schedules
GMT is Greenwich Mean Time. ( The
time at Zero Meridian. Greenwich )
There are 24 basic time zones in the world
Which are separated 15 degrees from both the
west and east of the zero meridian.