As documented in Time::Piece, strptime is a class method. The problem is caused by calling it as an instance method instead. 
#! /usr/bin/perl
use warnings;
use strict;

use Time::Piece;

print 'Time::Piece'->VERSION, "\n";
my $t = 'Time::Piece'->strptime($ARGV[0], '%s');
print "Input  $ARGV[0]\n";
print "Output ", $t->epoch(), "\n";
print $t, "\n";
print $t->strftime('%a %b %d %T %Y'), "\n";

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Test run:

$ TZ=Europe/Moscow 1.pl $(date +%s)
1.27
Input  1467613256
Output 1467613256
Mon Jul  4 06:20:56 2016
Mon Jul 04 06:20:56 2016

[download]

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In reply to Re: Time::Piece epoch parsing by choroba
in thread Time::Piece epoch parsing by vsespb

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