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RFC822 and ISO8601 date formats in Perl

Using only the standard POSIX module.

#!/usr/bin/perl -w

 use strict;
 use POSIX qw(strftime);

 my $now = time();

 # We need to munge the timezone indicator to add a colon between the hour and minute part
 my $tz = strftime("%z", localtime($now));
 $tz =~ s/(\d{2})(\d{2})/$1:$2/;

 # ISO8601
 print strftime("%Y-%m-%dT%H:%M:%S", localtime($now)) . $tz . "\n";
 # RFC822 (actually RFC2822, as the year has 4 digits)
 print strftime("%a, %d %b %Y %H:%M:%S %z", localtime($now)) . "\n";
to perl rfc822 iso8601 by gerikson on Sep 01, 2005
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