From: Victor Engmark <victor.engmark@terreactive•ch>
To: Andreas Ericsson <ae@op5•se>
Cc: Michael J Gruber <git@drmicha•warpmail.net>,
Brian Gernhardt <brian@gernhardtsoftware•com>,
"git@vger•kernel.org List" <git@vger•kernel.org>
Subject: Re: Approxidate with YYYY.MM
Date: Tue, 10 May 2011 09:40:08 +0200 [thread overview]
Message-ID: <4DC8EBD8.50707@terreactive.ch> (raw)
In-Reply-To: <964517.31047.1305010481774.JavaMail.trustmail@mail1.terreactive.ch>
On 05/10/2011 08:54 AM, Andreas Ericsson wrote:
> On 05/10/2011 08:35 AM, Michael J Gruber wrote:
>> Brian Gernhardt venit, vidit, dixit 09.05.2011 21:02:
>>> (This is in response to a discussion on #parrot.)
>>>
>>> Rakudo (https://github.com/rakudo/rakudo/) uses tags of the form
>>> YYYY.MM for their monthly releases. When we were attempting to find
>>> the cause of a slowdown, somewhat was trying to find what commits
>>> occurred after the 2011.01 release with "git log --after=2011.01".
>>> His mistake was pointed out but this led to the confusion of why this
>>> was parsed as "May 1 2011" instead of "Jan 1 2011". Shouldn't
>>> date.c:match_multi_number() parse something with only two numbers as
>>> a beginning of month instead of allowing it to pass through to the
>>> generic parsing?
>>
>> I just don't think there is a format like that. There is dd.mm.[yy]yy
>> and apparently also yyyy.mm.dd, but without leading zeros in mm for the
>> latter. Our date parser also takes "." for a space so that you don't
>> need to quote a space ("1.day.ago"). I can see the logic behind parsing
>> 2011.01 as January 2011, but it's a stretch from the existing formats:
>>
>
> It would be far more logical to parse "2011-01" as "January 2011" as
> that's the preferred way to write month-precision dates in most
> countries that use both the metric system and the gregorian calender.
>
> I've never seen that date-type with dot as a separator, but with the
> dash it's very, very common.
Seconded. ISO dates are getting pretty common, and in the extended
format hyphens are the default separator between year, month, and date
<https://secure.wikimedia.org/wikipedia/en/wiki/ISO_8601#Calendar_dates>.
A few notes on support:
GNU `date` 8.5 parses some ISO date strings correctly:
$ date --date='2001-02-03' +%Y-%m-%d\ %H:%M:%S
2001-02-03 00:00:00
$ date --date='2001-02-03 04:05:06' +%Y-%m-%d\ %H:%M:%S
2001-02-03 04:05:06
Unfortunately, it doesn't handle partial dates:
$ date --date='2001-02' +%Y-%m-%d\ %H:%M:%S
date: invalid date `2001-02'
But it does handle HH:MM:
$ date --date='04:05' +%Y-%m-%d\ %H:%M:%S
2011-05-10 04:05:00
Basic format dates are sometimes parsed correctly:
$ date --date='20010203' +%Y-%m-%d\ %H:%M:%S
2001-02-03 00:00:00
But not with seconds:
$ date --date='20010203040506' +%Y-%m-%d\ %H:%M:%S
2001020304-05-06 00:00:00
The W3C recommends the use of ISO dates:
<http://www.w3.org/QA/Tips/iso-date>, and their standards, like XML,
typically support only ISO dates (or a subset thereof).
Cheers,
Victor Engmark
next prev parent reply other threads:[~2011-05-10 7:40 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-09 19:02 Approxidate with YYYY.MM Brian Gernhardt
2011-05-10 6:35 ` Michael J Gruber
2011-05-10 6:54 ` Andreas Ericsson
2011-05-10 7:08 ` Michael J Gruber
[not found] ` <964517.31047.1305010481774.JavaMail.trustmail@mail1.terreactive.ch>
2011-05-10 7:40 ` Victor Engmark [this message]
2011-05-10 8:36 ` Michael J Gruber
2011-05-22 17:10 ` Michael Witten
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