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Re: Storing dates

From Denis McMahon <denismfmcmahon@gmail.com>
Newsgroups comp.databases.mysql, comp.lang.php
Subject Re: Storing dates
Date 2014-06-22 19:52 +0000
Organization A noiseless patient Spider
Message-ID <lo7c5k$8k5$2@dont-email.me> (permalink)
References (8 earlier) <hzk4wa449wa$.3xtj0jkxz78o$.dlg@40tude.net> <53A67D5D.5040408@arnowelzel.de> <c0ngttFu63jU1@mid.individual.net> <53A6EC88.4070607@arnowelzel.de> <wab44z6q2tyd.1b01vzkzvpxl4$.dlg@40tude.net>

Cross-posted to 2 groups.

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On Sun, 22 Jun 2014 13:55:49 -0400, richard wrote:

> On Sun, 22 Jun 2014 16:47:36 +0200, Arno Welzel wrote:
> 
>> Erick T. Barkhuis, 2014-06-22 10:03:
>> 
>>> Arno Welzel:
>>> 
>>>> 1967-09-12 for the 9. September of 1967 BTW: This is why ISO 8601 had
>>>> been invented
>>> 
>>> If that's the case, I don't like ISO 8601.
>> 
>> Of course it was just a typo and 1967-09-12 is for 12. September of
>> 1967 ;-)
> 
> But how are us humans supposed to know which comes first? what if you
> see 1967-31-09?

If you know it's an iso 8601 date then you know that the first 4 digits 
(1967) are the year, the next 2 digits (31) are the month and the last 2 
digits (09) are the day number.

> if it read 1967-Sep-09 then there is no guessing is there?

1967-sep-09 is not an iso 8601 date.

Iso 8601 defines a date as:

[4 digit Year Number][-][2 digit Month Number][-][2 digit Day Number]

So if "1967-31-09" was valid in iso 8601 it would actually be 
"1969-07-09" or the 9th of July 1969, because July 1969 is the 31st month 
starting at January 1967.

The reason iso 8601 is good is that in the string form, iso 8601 dates 
sort properly, ie ascending / descending string order is also ascending / 
descending date order. If you don't understand this, you obviously don't 
understand anything about string sorting either.

Oh right. You don't.

-- 
Denis McMahon, denismfmcmahon@gmail.com

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Thread

Putting it all together richard <noreply@example.com> - 2014-06-20 10:20 -0400
  Re: Putting it all together Evan Platt <evan@theobvious.espphotography.com.invalid> - 2014-06-20 08:11 -0700
    Re: Putting it all together richard <noreply@example.com> - 2014-06-20 11:24 -0400
      Re: Putting it all together Doug Miller <doug_at_milmac_dot_com@example.com> - 2014-06-20 17:15 +0000
      Re: Putting it all together Evan Platt <evan@theobvious.espphotography.com.invalid> - 2014-06-20 20:01 -0700
  Re: Putting it all together Jürgen Exner <jurgenex@hotmail.com> - 2014-06-20 08:21 -0700
  Re: Putting it all together Norman Peelman <npeelman@cfl.rr.com> - 2014-06-20 21:06 -0400
  Re: Putting it all together Denis McMahon <denismfmcmahon@gmail.com> - 2014-06-21 03:02 +0000
  Re: Putting it all together Denis McMahon <denismfmcmahon@gmail.com> - 2014-06-21 03:09 +0000
  Re: Putting it all together Jürgen Exner <jurgenex@hotmail.com> - 2014-06-20 20:13 -0700
    Re: Putting it all together richard <noreply@example.com> - 2014-06-20 23:34 -0400
      Re: Putting it all together Jürgen Exner <jurgenex@hotmail.com> - 2014-06-20 20:48 -0700
      Re: Putting it all together Evan Platt <evan@theobvious.espphotography.com.invalid> - 2014-06-20 21:00 -0700
      Re: Putting it all together Doug Miller <doug_at_milmac_dot_com@example.com> - 2014-06-21 04:22 +0000
        Re: Putting it all together Jürgen Exner <jurgenex@hotmail.com> - 2014-06-20 22:11 -0700
          Re: Putting it all together Evan Platt <evan@theobvious.espphotography.com.invalid> - 2014-06-20 22:39 -0700
        Re: Putting it all together gordonb.zp2md@burditt.org (Gordon Burditt) - 2014-06-21 04:15 -0500
          Storing dates (was: Putting it all together) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-06-21 12:15 +0200
            Re: Storing dates richard <noreply@example.com> - 2014-06-21 11:10 -0400
              Re: Storing dates Doug Miller <doug_at_milmac_dot_com@example.com> - 2014-06-21 17:42 +0000
                Re: Storing dates richard <noreply@example.com> - 2014-06-21 14:28 -0400
                Re: Storing dates Jürgen Exner <jurgenex@hotmail.com> - 2014-06-21 12:04 -0700
                Re: Storing dates Doug Miller <doug_at_milmac_dot_com@example.com> - 2014-06-21 19:06 +0000
                Re: Storing dates Tim Streater <timstreater@greenbee.net> - 2014-06-21 22:06 +0100
                Re: Storing dates Jerry Stuckle <jstucklex@attglobal.net> - 2014-06-21 17:09 -0400
                Re: Storing dates Tim Streater <timstreater@greenbee.net> - 2014-06-21 22:33 +0100
                Re: Storing dates Jerry Stuckle <jstucklex@attglobal.net> - 2014-06-21 17:49 -0400
                Re: Storing dates Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-06-22 14:38 +0200
                Re: Storing dates Jürgen Exner <jurgenex@hotmail.com> - 2014-06-21 14:31 -0700
                Re: Storing dates Tim Streater <timstreater@greenbee.net> - 2014-06-21 22:44 +0100
                Re: Storing dates Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-06-22 14:59 +0200
                Re: Storing dates Denis McMahon <denismfmcmahon@gmail.com> - 2014-06-21 23:19 +0000
                Re: Storing dates Arno Welzel <usenet@arnowelzel.de> - 2014-06-22 08:53 +0200
                Re: Storing dates "Erick T. Barkhuis" <erick.use-net@ardane.c.o.m> - 2014-06-22 08:03 +0000
                Re: Storing dates Jerry Stuckle <jstucklex@attglobal.net> - 2014-06-22 09:29 -0400
                Re: Storing dates "Erick T. Barkhuis" <erick.use-net@ardane.c.o.m> - 2014-06-22 14:24 +0000
                Re: Storing dates Jerry Stuckle <jstucklex@attglobal.net> - 2014-06-22 10:32 -0400
                Re: Storing dates "Erick T. Barkhuis" <erick.use-net@ardane.c.o.m> - 2014-06-22 14:45 +0000
                Re: Storing dates Denis McMahon <denismfmcmahon@gmail.com> - 2014-06-22 19:44 +0000
                Re: Storing dates Jürgen Exner <jurgenex@hotmail.com> - 2014-06-22 08:26 -0700
                Re: Storing dates gordonb.q26od@burditt.org (Gordon Burditt) - 2014-06-22 10:00 -0500
                Re: Storing dates Arno Welzel <usenet@arnowelzel.de> - 2014-06-22 16:47 +0200
                Re: Storing dates richard <noreply@example.com> - 2014-06-22 13:55 -0400
                Re: Storing dates Jürgen Exner <jurgenex@hotmail.com> - 2014-06-22 12:31 -0700
                Re: Storing dates Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-06-24 22:27 +0200
                Re: Storing dates Denis McMahon <denismfmcmahon@gmail.com> - 2014-06-22 19:52 +0000
                Re: Storing dates Arno Welzel <usenet@arnowelzel.de> - 2014-06-22 21:52 +0200
                Re: Storing dates richard <noreply@example.com> - 2014-06-22 14:05 -0400
                Re: Storing dates Arno Welzel <usenet@arnowelzel.de> - 2014-06-22 21:56 +0200
                Re: Storing dates richard <noreply@example.com> - 2014-06-22 22:46 -0400
                Re: Storing dates Arno Welzel <usenet@arnowelzel.de> - 2014-06-23 08:11 +0200
                Re: Storing dates richard <noreply@example.com> - 2014-06-23 02:37 -0400
                Re: Storing dates Arno Welzel <usenet@arnowelzel.de> - 2014-06-23 11:10 +0200
                Re: Storing dates Evan Platt <evan@theobvious.espphotography.com.invalid> - 2014-06-23 06:50 -0700
                Re: Storing dates richard <noreply@example.com> - 2014-06-23 11:13 -0400
                Re: Storing dates Evan Platt <evan@theobvious.espphotography.com.invalid> - 2014-06-23 09:13 -0700
                Re: Storing dates Arno Welzel <usenet@arnowelzel.de> - 2014-06-23 22:33 +0200
                Re: Storing dates richard <noreply@example.com> - 2014-06-22 23:04 -0400
                Re: Storing dates Arno Welzel <usenet@arnowelzel.de> - 2014-06-23 08:12 +0200
                Re: Storing dates Geoff Muldoon <geoff.muldoon@trap.gmail.com> - 2014-06-23 16:45 +1000
                Re: Storing dates richard <noreply@example.com> - 2014-06-23 07:58 -0400
                Re: Storing dates Jürgen Exner <jurgenex@hotmail.com> - 2014-06-23 09:50 -0700
                Re: Storing dates Christoph Michael Becker <cmbecker69@arcor.de> - 2014-06-23 19:02 +0200
                Re: Storing dates Geoff Muldoon <geoff.muldoon@trap.gmail.com> - 2014-06-24 12:00 +1000
                Re: Storing dates Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-06-24 22:38 +0200
                Re: Storing dates Jürgen Exner <jurgenex@hotmail.com> - 2014-06-22 15:30 -0700
                Re: Storing dates "Peter H. Coffin" <hellsop@ninehells.com> - 2014-06-22 20:10 -0500
          Re: Putting it all together Jürgen Exner <jurgenex@hotmail.com> - 2014-06-21 03:34 -0700
      Re: Putting it all together Denis McMahon <denismfmcmahon@gmail.com> - 2014-06-21 10:23 +0000
      Re: Putting it all together bill <william@TechServSys.com> - 2014-06-21 07:03 -0400
        Re: Putting it all together Denis McMahon <denismfmcmahon@gmail.com> - 2014-06-21 15:11 +0000
      Re: Putting it all together "Peter H. Coffin" <hellsop@ninehells.com> - 2014-06-21 10:57 -0500
      Re: Putting it all together Arno Welzel <usenet@arnowelzel.de> - 2014-06-22 08:45 +0200

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