Date: Fri, 8 Mar 2002 13:46:27 -0800 From: "Crist J. Clark" <cjc@FreeBSD.ORG> To: Michael Stevens <mstevens@seshat.demon.co.uk> Cc: perlbug@perl.com, hackers@FreeBSD.ORG Subject: Re: bug in Time::Local (can't handle 1901) Message-ID: <20020308134627.F57999@blossom.cjclark.org> In-Reply-To: <20020308164115.C2A165D02D@penfold.unixbeard.net>; from mstevens@seshat.demon.co.uk on Fri, Mar 08, 2002 at 04:41:15PM %2B0000 References: <20020308164115.C2A165D02D@penfold.unixbeard.net>
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On Fri, Mar 08, 2002 at 04:41:15PM +0000, Michael Stevens wrote:
> This is a bug report for perl from mstevens@etla.org,
> generated with the help of perlbug 1.26 running under perl 5.00503.
>
>
> -----------------------------------------------------------------
> [Please enter your report here]
>
> michaels@host:~> perl -MTime::Local -e 'timegm(0,0,0, 01, 01, 1901)'
> Can't handle date (0, 0, 0, 1, 1, 1) at -e line 1
>
> This seems contrary to the documentation which suggests that this is
> a perfectly valid date that will be handled as 1901.
It so happens that the 2^31 seconds before the UNIX epcoh falls on
Fri Dec 13 20:45:52 UTC 1901.
$ date -ju 190112132045.52
Fri Dec 13 20:45:52 UTC 1901
$ date -ju 190112132045.51
date: nonexistent time
$ date -ju 190112132045.52 +%s
-2147483648
$ dc
2
31^
p
2147483648
mktime(3) will choke on dates before Fri Dec 13 20:45:52 UTC 1901.
--
Crist J. Clark | cjclark@alum.mit.edu
| cjclark@jhu.edu
http://people.freebsd.org/~cjc/ | cjc@freebsd.org
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