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Converting Unix Timestamp to Date

How to convert a Unix timestamp to a readable date using command line tools.

Using Perl

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TIMESTAMP=1173279767
perl -e "print scalar(localtime($TIMESTAMP))"

Using Perl with ctime module

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TIMESTAMP=1173279767
perl -e "require 'ctime.pl'; print &ctime($TIMESTAMP);"

Using Shell with awk

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echo 1173279767 | awk '{print strftime("%c",$1)}'

Using Shell with date

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TIMESTAMP=1173279767
date -d "1970-01-01 $TIMESTAMP sec GMT"

Or even simpler:

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date -d@1234567890