The unix time stamp is a way to track time as a running total of seconds. This count starts at the Unix Epoch on January 1st, at UTC. Therefore, the unix time stamp is merely the number of seconds between a particular date and the Unix Epoch.
Using date with the second parameter as timestamp, as shown in answer, will not print the date in local timezone. Date will be printed with timezone info ignored, cause the timestamp doesn't have timezone info. gmdate and date with second timestamp parameter as will print the same date time. – Tinus Tate Apr 7 '16 at
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