UNIX timestamp-epoch to UTC date

Convert Unix Timestamps, the time in seconds or milliseconds since the Unix Epoch, to a UTC date.

The Unix epoch was on 1970-01-01 00:00:00 UTC.

Now, the time in seconds since the Epoch is 1742200254.

Examples:
!epoch 1333333333
!epoch 12345678901
!epoch -24681012
!epoch 9999999999ms
!epoch 1010101010
!epoch -8888 ms
!epoch 10101010101
!epoch -2000
!epoch 1234567890
!epoch -1234567890
!epoch -74711160000
!epoch -9876543210 ms

  
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