Received: (at 72023) by debbugs.gnu.org; 10 Jul 2024 10:45:17 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Jul 10 06:45:17 2024 Received: from localhost ([127.0.0.1]:54975 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sRUp3-0001QK-80 for submit <at> debbugs.gnu.org; Wed, 10 Jul 2024 06:45:17 -0400 Received: from mail.cs.ucla.edu ([131.179.128.66]:59104) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eggert@HIDDEN>) id 1sRUp1-00013c-NB for 72023 <at> debbugs.gnu.org; Wed, 10 Jul 2024 06:45:16 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id 809153C00E414; Wed, 10 Jul 2024 03:45:02 -0700 (PDT) Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10032) with ESMTP id qof3bWPZ4mf1; Wed, 10 Jul 2024 03:45:01 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id D76903C00E420; Wed, 10 Jul 2024 03:45:01 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.cs.ucla.edu D76903C00E420 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=9D0B346E-2AEB-11ED-9476-E14B719DCE6C; t=1720608301; bh=iNa20bSqXqj0DOJWPTuEXoI5LvuwstP+r3zbWp7fbFc=; h=Message-ID:Date:MIME-Version:To:From; b=HbD7Bgt2kzbNZCm+XCKGzGqz/p5u9TGeQl2ofJqYg228JVU29PIep4XrFgn7+IhSp JzYQEKgmPefTEquzUdBzi2yi9kCnfugmngyQ1eE9NwsTvW5TSekzIWQoTJPhIKe7zF 3uZKx4Vb3D8x+Y58k5JjdvnM909vDzHzMzApEEnjvMLSVkya42KHlONC0BRd9D8twe 8igU8Xp3K7qvP9StDCLK8YXtAksy3XNqDM5b5TGD5iA8/ayOev5g9yxxI/h3j7PFSm Bccrd53ArikxGAyoEF1uVfaoxoUVdnJjiJsN+p6rbEK9xgXv0KdpRN8eFa7l7LQinr Zh+Ts9Z/xPpgA== X-Virus-Scanned: amavis at mail.cs.ucla.edu Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10026) with ESMTP id 9g1w2kq9fXdt; Wed, 10 Jul 2024 03:45:01 -0700 (PDT) Received: from [192.168.1.103] (i15-les02-ntr-176-181-187-105.sfr.lns.abo.bbox.fr [176.181.187.105]) by mail.cs.ucla.edu (Postfix) with ESMTPSA id 278EA3C00E414; Wed, 10 Jul 2024 03:45:00 -0700 (PDT) Message-ID: <24aef099-3224-417a-b0ee-06fea7ae0540@HIDDEN> Date: Wed, 10 Jul 2024 12:44:52 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: bug#72023: feature request for date(1): strptime-style format string when you don't want date to guess To: mark.yagnatinsky@HIDDEN, 72023 <at> debbugs.gnu.org References: <CH3PR12MB7619C3466E47EAB1ED99D80CF9DB2@HIDDEN> Content-Language: en-US From: Paul Eggert <eggert@HIDDEN> In-Reply-To: <CH3PR12MB7619C3466E47EAB1ED99D80CF9DB2@HIDDEN> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 72023 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) I'm dubious. I've never had much luck with strptime, as in practice it has its own glitches that are even worse than what 'date' currently uses. For example, it's dicey in non-C locales, and it mishandles time zones and daylight saving transitions even in the C locale. That being said, if someone can write the code and documentation and test cases it might be a good thing to have - particularly if some other 'date' implementation is already doing that sort of thing and people have had good experience with it.
bug-coreutils@HIDDEN
:bug#72023
; Package coreutils
.
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charset="us-ascii" Content-Transfer-Encoding: quoted-printable I suspect this has been requested many times over the decades but I haven= 't found anything in the issue tracker so... The date command lets you choose my output format, but for input it tries= =20to figure it out without hints. For interactive use, this is great. For usage in scripts, this is less than ideal, because that means you nee= d to understand the heuristics to have confidence that your script will d= o what you want. For instance, this page: https://www.gnu.org/software/coreutils/manual/html_node/Pure-numbers-in-d= ate-strings.html says that "If the decimal number is of the form yyyymmdd [...] yyyy is re= ad as the year" I stared at that sentence for a bit in confusion, thinking to myself "but= =20how could it possibly KNOW that the number is of the form yyyymmdd??" I finally realized that what it's really saying is that "if the number is= =20exactly 8 digits long, we ASSUME that the first four digits are the ye= ar". Thus, if you have an 8-digit number that you want to interpret differentl= y then you should massage it before passing it to date. As it happens, I have an 8 digit number, and indeed the built-in assumpti= ons happen to be a perfect fit for me. But I still don't like to rely on them if I don't have to, and would rath= er just tell it what I already know, instead of forcing date(1) to re-der= ive it. Thoughts? Mark. This message is for information purposes only. It is not a recommendation= , advice, offer or solicitation to buy or sell a product or service, nor = an official confirmation of any transaction. It is directed at persons wh= o are professionals and is intended for the recipient(s) only. It is not = directed at retail customers. This message is subject to the terms at: ht= tps://www.ib.barclays/disclosures/web-and-email-disclaimer.html.=20 For important disclosures, please see: https://www.ib.barclays/disclosure= s/sales-and-trading-disclaimer.html regarding marketing commentary from B= arclays Sales and/or Trading desks, who are active market participants; h= ttps://www.ib.barclays/disclosures/barclays-global-markets-disclosures.ht= ml regarding our standard terms for Barclays Investment Bank where we tra= de with you in principal-to-principal wholesale markets transactions; and= =20in respect to Barclays Research, including disclosures relating to spe= cific issuers, see: https://publicresearch.barclays.com. _________________________________________________________________________= _________=20 If you are incorporated or operating in Australia, read these important d= isclosures: https://www.ib.barclays/disclosures/important-disclosures-asi= a-pacific.html. _________________________________________________________________________= _________ For more details about how we use personal information, see our privacy n= otice: https://www.ib.barclays/disclosures/personal-information-use.html.= =20 _________________________________________________________________________= _________ --_000_CH3PR12MB7619C3466E47EAB1ED99D80CF9DB2CH3PR12MB7619namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-mi= crosoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:wo= rd" xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D= "http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-asci= i"> <meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)">= <style><!-- /* Font Definitions */ @font-face =09{font-family:"Cambria Math"; =09panose-1:2 4 5 3 5 4 6 3 2 4;} @font-face =09{font-family:Calibri; =09panose-1:2 15 5 2 2 2 4 3 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal =09{margin:0in; =09font-size:11.0pt; =09font-family:"Calibri",sans-serif; =09mso-ligatures:standardcontextual;} a:link, span.MsoHyperlink =09{mso-style-priority:99; =09color:#0563C1; =09text-decoration:underline;} span.EmailStyle17 =09{mso-style-type:personal-compose; =09font-family:"Calibri",sans-serif; =09color:windowtext;} .MsoChpDefault =09{mso-style-type:export-only;} @page WordSection1 =09{size:8.5in 11.0in; =09margin:1.0in 1.0in 1.0in 1.0in;} div.WordSection1 =09{page:WordSection1;} --></style><!--[if gte mso 9]><xml> <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--> </head> <body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72" style=3D"word-wra= p:break-word"> <div class=3D"WordSection1"> <p class=3D"MsoNormal">I suspect this has been requested many times over = the decades but I haven’t found anything in the issue tracker so= 230;<o:p></o:p></p> <p class=3D"MsoNormal">The date command lets you choose my output format,= =20but for input it tries to figure it out without hints. For inter= active use, this is great.<o:p></o:p></p> <p class=3D"MsoNormal">For usage in scripts, this is less than ideal, bec= ause that means you need to understand the heuristics to have confidence = that your script will do what you want.<o:p></o:p></p> <p class=3D"MsoNormal">For instance, this page:<o:p></o:p></p> <p class=3D"MsoNormal"><a href=3D"https://www.gnu.org/software/coreutils/= manual/html_node/Pure-numbers-in-date-strings.html">https://www.gnu.org/s= oftware/coreutils/manual/html_node/Pure-numbers-in-date-strings.html</a><= o:p></o:p></p> <p class=3D"MsoNormal">says that “If the decimal number is of the f= orm yyyymmdd […] yyyy is read as the year”<o:p></o:p></p> <p class=3D"MsoNormal">I stared at that sentence for a bit in confusion, = thinking to myself “but how could it possibly KNOW that the number = is of the form yyyymmdd??”<o:p></o:p></p> <p class=3D"MsoNormal">I finally realized that what it’s really say= ing is that “if the number is exactly 8 digits long, we ASSUME that= =20the first four digits are the year”.<o:p></o:p></p> <p class=3D"MsoNormal">Thus, if you have an 8-digit number that you want = to interpret differently then you should massage it before passing it to = date.<o:p></o:p></p> <p class=3D"MsoNormal"><o:p> </o:p></p> <p class=3D"MsoNormal">As it happens, I have an 8 digit number, and indee= d the built-in assumptions happen to be a perfect fit for me.<o:p></o:p><= /p> <p class=3D"MsoNormal">But I still don’t like to rely on them if I = don’t have to, and would rather just tell it what I already know, i= nstead of forcing date(1) to re-derive it.<o:p></o:p></p> <p class=3D"MsoNormal"><o:p> </o:p></p> <p class=3D"MsoNormal">Thoughts?<o:p></o:p></p> <p class=3D"MsoNormal">Mark.<o:p></o:p></p> </div> <P><SPAN lang=3DEN-US style=3D"mso-ansi-language: EN-US">This message is = for=20 information purposes only. It is not a recommendation, advice, offer or=20 solicitation to buy or sell a product or service, nor an official confirm= ation=20 of any transaction. It is directed at persons who are professionals and i= s=20 intended for the recipient(s) only. It is not directed at retail customer= s. This=20 message is subject to the terms at: <A=20 href=3D"https://www.ib.barclays/disclosures/web-and-email-disclaimer.html= ">https://www.ib.barclays/disclosures/web-and-email-disclaimer.html</A>. = </SPAN></P> <P><SPAN lang=3DEN-US style=3D"mso-ansi-language: EN-US">For important di= sclosures,=20 please see: <A=20 href=3D"https://www.ib.barclays/disclosures/sales-and-trading-disclaimer.= html">https://www.ib.barclays/disclosures/sales-and-trading-disclaimer.ht= ml</A>=20 regarding marketing commentary from Barclays Sales and/or Trading desks, = who are=20 active market participants; <A=20 href=3D"https://www.ib.barclays/disclosures/barclays-global-markets-discl= osures.html">https://www.ib.barclays/disclosures/barclays-global-markets-= disclosures.html</A>=20 regarding our standard terms for Barclays Investment Bank where we trade = with=20 you in principal-to-principal wholesale markets transactions; and in resp= ect to=20 Barclays Research, including disclosures relating to specific issuers, se= e: <A=20 href=3D"https://publicresearch.barclays.com">https://publicresearch.barcl= ays.com</A>.<BR>_________________________________________________________= _________________________=20 <BR>If you are incorporated or operating in Australia, read these importa= nt=20 disclosures: <A=20 href=3D"https://www.ib.barclays/disclosures/important-disclosures-asia-pa= cific.html">https://www.ib.barclays/disclosures/important-disclosures-asi= a-pacific.html</A>.<BR>__________________________________________________= ________________________________<BR>For=20 more details about how we use personal information, see our privacy notic= e: <A=20 href=3D"https://www.ib.barclays/disclosures/personal-information-use.html= ">https://www.ib.barclays/disclosures/personal-information-use.html</A>. = <BR>_____________________________________________________________________= _____________<BR></O:P></SPAN></P> </body> </html> --_000_CH3PR12MB7619C3466E47EAB1ED99D80CF9DB2CH3PR12MB7619namp_--
<mark.yagnatinsky@HIDDEN>
:bug-coreutils@HIDDEN
.
Full text available.bug-coreutils@HIDDEN
:bug#72023
; Package coreutils
.
Full text available.
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.