From:	"Alex Vinokur" <alexvn AT bigfoot DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: mktime() for 1969 & 2106
Date:	Wed, 22 May 2002 07:59:54 +0200
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"Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il> wrote in message news:4098-Tue21May2002191554+0300-eliz AT is DOT elta DOT co DOT il...
| > From: Alex Vinokur <alexvn AT bigfoot DOT com>
| > Newsgroups: comp.os.msdos.djgpp
| > Date: Tue, 21 May 2002 15:21:07 +0200
| >
| > We can see that still there is a problem in interval
| > [ 1970:01:01::00:00:00  -  1970:01:01::01:59:58 ].
|
| For your timezone, any time before 1970:01:01::01:59:59 is invalid,
| since that's before the beginning of the epoch (you are 2 hours ahead
| of UTC).  The fact that some values before that _are_ representable
| is probably some subtle bug in mktime.
|
[snip]

Yes, it is. Also for 2106.

--------- mktime() results : BEGIN ---------

DATA-TIME  1969:12:31::23:00:57 ---> mktime() can't return required time
DATA-TIME  1969:12:31::23:00:58 ---> mktime() can't return required time
DATA-TIME  1969:12:31::23:00:59 ---> mktime() can't return required time
DATA-TIME  1969:12:31::23:01:00 ---> mktime() can't return required time
DATA-TIME  1969:12:31::23:01:01 ---> mktime() can't return required time
DATA-TIME  1969:12:31::23:01:02 ---> mktime() can't return required time

DATA-TIME  1969:12:31::23:59:57 ---> mktime() can't return required time
DATA-TIME  1969:12:31::23:59:58 ---> mktime() can't return required time
DATA-TIME  1969:12:31::23:59:59 ---> mktime() can't return required time
DATA-TIME  1970:01:01::00:00:00 ---> 004294960096
DATA-TIME  1970:01:01::00:00:01 ---> 004294960097
DATA-TIME  1970:01:01::00:00:02 ---> 004294960098

DATA-TIME  1970:01:01::01:00:00 ---> 004294963696
DATA-TIME  1970:01:01::01:00:01 ---> 004294963697
DATA-TIME  1970:01:01::01:00:02 ---> 004294963698

DATA-TIME  1970:01:01::01:59:57 ---> 004294967293
DATA-TIME  1970:01:01::01:59:58 ---> 004294967294
DATA-TIME  1970:01:01::01:59:59 ---> mktime() can't return required time
DATA-TIME  1970:01:01::02:00:00 ---> 000000000000
DATA-TIME  1970:01:01::02:00:01 ---> 000000000001
DATA-TIME  1970:01:01::02:00:02 ---> 000000000002

DATA-TIME  1970:01:01::03:00:00 ---> 000000003600
DATA-TIME  1970:01:01::03:00:01 ---> 000000003601
DATA-TIME  1970:01:01::03:00:02 ---> 000000003602



DATA-TIME  2106:02:07::06:28:12 ---> 004294960092
DATA-TIME  2106:02:07::06:28:13 ---> 004294960093
DATA-TIME  2106:02:07::06:28:14 ---> 004294960094
DATA-TIME  2106:02:07::06:28:15 ---> 004294960095
DATA-TIME  2106:02:07::06:28:16 ---> 004294960096
DATA-TIME  2106:02:07::06:28:17 ---> 004294960097
DATA-TIME  2106:02:07::06:28:18 ---> 004294960098

DATA-TIME  2106:02:07::08:28:11 ---> 004294967291
DATA-TIME  2106:02:07::08:28:12 ---> 004294967292
DATA-TIME  2106:02:07::08:28:13 ---> 004294967293
DATA-TIME  2106:02:07::08:28:14 ---> 004294967294
DATA-TIME  2106:02:07::08:28:15 ---> mktime() can't return required time
DATA-TIME  2106:02:07::08:28:16 ---> 000000000000
DATA-TIME  2106:02:07::08:28:17 ---> 000000000001
DATA-TIME  2106:02:07::08:28:18 ---> 000000000002
DATA-TIME  2106:02:07::08:28:19 ---> 000000000003

DATA-TIME  2106:02:07::08:28:57 ---> 000000000041
DATA-TIME  2106:02:07::08:28:58 ---> 000000000042
DATA-TIME  2106:02:07::08:28:59 ---> 000000000043
DATA-TIME  2106:02:07::08:29:00 ---> mktime() can't return required time
DATA-TIME  2106:02:07::08:29:01 ---> mktime() can't return required time
DATA-TIME  2106:02:07::08:29:02 ---> mktime() can't return required time
DATA-TIME  2106:02:07::08:29:03 ---> mktime() can't return required time

--------- mktime() results : END -----------


Are 'mktime() implementations on different platforms' essentially different ?

Similar program on SunOS 5.6 with gcc 2.91.57 had no problem :
  http://groups.google.com/groups?selm=7vrrsi%24ii8%241%40nnrp1.deja.com

Thanks.


--
====================
  Alex Vinokur
    http://up.to/alexvn
    http://go.to/alexv_math
    mailto:alexvn AT bigfoot DOT com
    mailto:alexvn AT go DOT to
  ====================

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