atomic time
Coordinated Universal Time
hydrogen maser atomic clock
isochronon
hour
time of day
clock
time recorder
atomic clock
calendar clock
system clock
clock time
o'clock
time
slave clock
longcase
tall-case clock
grandfather clock
world clock
regulator
tell time
master clock
clocklike
chronometer
water glass
clepsydra
clocking
water clock
game clock
dial
pseudosynchronous
digital clock
radio clock
misclock
hour hand
little hand
proper time
clockworky
second hand
body clock
hourplate
face
clock dial
electric clock
bioclock
clock face
biochronometer
military time
orrery
turret clock