Returns a time stamp from the given UNIX epoch time.
Namespace
datetime
Input
seconds(int|string), base timestamp(timestamp|string)
Output
timestamp(timestamp)
Example
If seconds contains the value 2563 and basetimestamp contains the timestamp 2008–08–18 22:30:52, then the two following functions are equivalent, and return the timestamp 2008–08–18 23:13:35
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