Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.c++ > #67769
| From | Keith Thompson <kst-u@mib.org> |
|---|---|
| Newsgroups | comp.lang.c++, comp.lang.c |
| Subject | Re: "C++: Size Matters in Platform Compatibility" |
| Date | 2019-08-18 14:49 -0700 |
| Organization | None to speak of |
| Message-ID | <lnk1ba400b.fsf@kst-u.example.com> (permalink) |
| References | <qj6ung$map$1@dont-email.me> <qj8u95$3if$1@dont-email.me> <mnkglelt8koldbugfin9q27eb3qptod8b5@4ax.com> <qjb9fj$mis$1@dont-email.me> <apbjlellues8gc3sicok1189p3krftan98@4ax.com> |
Cross-posted to 2 groups.
Geoff <geoff@invalid.invalid> writes:
> On Sun, 18 Aug 2019 12:32:18 +0200, David Brown
> <david.brown@hesbynett.no> wrote:
>
>>> The UNIX epoch-based 64-bit time is good only if you believe the sun
>>> will only last another 2.147 billion years.
>>
>>292 billion years, by my counting. By that time, any issues with
>>rollover will be an SEP¹.
>
> Where are you getting that? time_t is the number of seconds since
> January 1, 1970, 0:00 UTC and as a 64-bit integer that's not 292
> billion years.
Yes, it is. A signed 64-bit time_t has a maximum value of 2**63-1.
2**63-1 seconds is just over 292 billion years.
The GNU coreutils "date" command gives an out of range error
for dates past Dec 31 in the year 2147485547, but that's not a
time_t issue. Similarly, the type struct tm has tm_year as an int,
which imposes the same limit on systems where int is 32 bits.
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Will write code for food.
void Void(void) { Void(); } /* The recursive call of the void */
Back to comp.lang.c++ | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
"C++: Size Matters in Platform Compatibility" Lynn McGuire <lynnmcguire5@gmail.com> - 2019-08-16 14:04 -0500
Re: "C++: Size Matters in Platform Compatibility" Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-08-16 20:45 +0000
Re: "C++: Size Matters in Platform Compatibility" David Brown <david.brown@hesbynett.no> - 2019-08-17 15:08 +0200
Re: "C++: Size Matters in Platform Compatibility" Geoff <geoff@invalid.invalid> - 2019-08-17 12:43 -0700
Re: "C++: Size Matters in Platform Compatibility" David Brown <david.brown@hesbynett.no> - 2019-08-18 12:32 +0200
Re: "C++: Size Matters in Platform Compatibility" Geoff <geoff@invalid.invalid> - 2019-08-18 13:10 -0700
Re: "C++: Size Matters in Platform Compatibility" Bart <bc@freeuk.com> - 2019-08-18 21:15 +0100
Re: "C++: Size Matters in Platform Compatibility" Keith Thompson <kst-u@mib.org> - 2019-08-18 14:49 -0700
Re: "C++: Size Matters in Platform Compatibility" Keith Thompson <kst-u@mib.org> - 2019-08-18 14:51 -0700
Re: "C++: Size Matters in Platform Compatibility" David Brown <david.brown@hesbynett.no> - 2019-08-19 08:43 +0200
Re: "C++: Size Matters in Platform Compatibility" "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2019-08-19 09:15 +0200
Re: "C++: Size Matters in Platform Compatibility" Öö Tiib <ootiib@hot.ee> - 2019-08-19 01:07 -0700
Re: "C++: Size Matters in Platform Compatibility" Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-21 17:14 +0200
Re: "C++: Size Matters in Platform Compatibility" Eli the Bearded <*@eli.users.panix.com> - 2019-08-21 18:30 +0000
Re: "C++: Size Matters in Platform Compatibility" scott@slp53.sl.home (Scott Lurndal) - 2019-08-21 19:05 +0000
Re: "C++: Size Matters in Platform Compatibility" Bonita Montero <Bonita.Montero@gmail.com> - 2019-08-21 21:25 +0200
Re: "C++: Size Matters in Platform Compatibility" Keith Thompson <kst-u@mib.org> - 2019-08-21 12:28 -0700
Re: "C++: Size Matters in Platform Compatibility" Richard Damon <Richard@Damon-Family.org> - 2019-08-22 22:58 -0400
Re: "C++: Size Matters in Platform Compatibility" Eli the Bearded <*@eli.users.panix.com> - 2019-08-23 19:15 +0000
Re: "C++: Size Matters in Platform Compatibility" Anton Shepelev <anton.txt@gmail.com> - 2019-08-18 15:59 +0300
Re: "C++: Size Matters in Platform Compatibility" David Brown <david.brown@hesbynett.no> - 2019-08-18 16:32 +0200
Re: "C++: Size Matters in Platform Compatibility" Juha Nieminen <nospam@thanks.invalid> - 2019-08-19 07:29 +0000
Re: "C++: Size Matters in Platform Compatibility" Paavo Helde <myfirstname@osa.pri.ee> - 2019-08-19 12:20 +0300
Re: "C++: Size Matters in Platform Compatibility" David Brown <david.brown@hesbynett.no> - 2019-08-19 11:22 +0200
Re: "C++: Size Matters in Platform Compatibility" Richard Damon <Richard@Damon-Family.org> - 2019-08-23 14:14 -0400
Re: "C++: Size Matters in Platform Compatibility" David Brown <david.brown@hesbynett.no> - 2019-08-24 20:56 +0200
Re: "C++: Size Matters in Platform Compatibility" Robert Wessel <robertwessel2@yahoo.com> - 2019-08-24 23:43 -0500
Re: "C++: Size Matters in Platform Compatibility" David Brown <david.brown@hesbynett.no> - 2019-08-25 12:11 +0200
Re: "C++: Size Matters in Platform Compatibility" Richard Damon <Richard@Damon-Family.org> - 2019-08-25 07:33 -0700
Re: "C++: Size Matters in Platform Compatibility" David Brown <david.brown@hesbynett.no> - 2019-08-25 20:27 +0200
Re: "C++: Size Matters in Platform Compatibility" Robert Wessel <robertwessel2@yahoo.com> - 2019-08-25 10:22 -0500
Re: "C++: Size Matters in Platform Compatibility" Lynn McGuire <lynnmcguire5@gmail.com> - 2019-08-19 15:05 -0500
Re: "C++: Size Matters in Platform Compatibility" scott@slp53.sl.home (Scott Lurndal) - 2019-08-19 20:17 +0000
Re: "C++: Size Matters in Platform Compatibility" David Brown <david.brown@hesbynett.no> - 2019-08-20 08:21 +0200
Re: "C++: Size Matters in Platform Compatibility" Lynn McGuire <lynnmcguire5@gmail.com> - 2019-08-20 14:38 -0500
Re: "C++: Size Matters in Platform Compatibility" James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-08-21 09:15 -0400
Re: "C++: Size Matters in Platform Compatibility" Anton Shepelev <anton.txt@gmail.com> - 2019-08-18 15:20 +0300
Re: "C++: Size Matters in Platform Compatibility" Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-08-18 14:50 +0100
csiph-web