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#!/usr/bin/env perl
use strict;
use warnings;
use Time::Piece;
use Pod::Usage;

&main; exit;

sub show($) {
    my $time = shift;
    printf "%s %s\n", $time->strftime("%Y-%m-%d %H:%M:%S%z"), $time->epoch;
}

sub main {
    my $stuff = shift @ARGV;
    if (!defined $stuff) {
        show(localtime());
    } elsif ($stuff =~ /^\d{4}-\d\d$/) {
        my $first = localtime()->strptime($stuff, '%Y-%m');
        my $last = localtime()->strptime($stuff . '-' . $first->month_last_day . ' 23:59:59', '%Y-%m-%d %H:%M:%S');
        show($first);
        show($last);
    } elsif ($stuff =~ /^\d{4}-\d\d-\d\d$/) {
        show(localtime()->strptime($stuff . ' 00:00:00', '%Y-%m-%d %H:%M:%S'));
        show(localtime()->strptime($stuff . ' 23:59:59', '%Y-%m-%d %H:%M:%S'));
    } elsif ($stuff =~ /^\d+$/) {
        show(localtime($stuff));
    } else {
        pod2usage(1);
    }
}


__END__

=head1 SYNOPSIS

    % epoch 2013-05
    % epoch