I am trying to convert a file date to epoch using a single line of code in Solaris 10, which uses an older version of perl.

I have been able to convert epoch to a date with your assistance:

echo $epoch | perl -MPOSIX -e 'print strftime("%m%d%H%M", gtime <stdin>)'

However, I would like to now reverse this process.

I was thinking about something like the following:

echo "Mar 20 2018 09:00" | perl -MPOSIX -e 'print strptime(<stdin>, "%s")'

But, I receive an error "Undefined subroutine &main::strptime called at -e line 1, <stdin> line 1. I tried substituting <stdin> with $ARGV[0] but still receive a subroutine error.

In reply to Date to Epoch by Anonymous Monk

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