The atomic clock "set properly" and the person perceiving it to be "5 hours behind" are most likely going by the time used in different time zones as references.
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An atomic clock - which measures the frequency with which atoms move in and out of excited states.
In the past, a common time measuring instrument was the sundial. Today, the usual measuring instruments for time are clocks and watches. For highly accurate measurement of time an atomic clock is used. Stop watches are also used to measure time in some sports.
When your atomic clock loses an hour especially during a time change there may be two different causes. First the batteries must be fresh. Next there may obstruction between you and the broadcast transmitter in Colorado Springs, Colorado. Put the clock in the window that faces Colorado for a day after changing the batteries.
o' clock
the full form of it is of the clock