GNU bug report logs - #14613
Date -- incorrect invalid date

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Package: coreutils; Severity: wishlist; Reported by: "Chris F.A. Johnson" <chris@HIDDEN>; dated Thu, 13 Jun 2013 22:26:02 UTC; Maintainer for coreutils is bug-coreutils@HIDDEN.

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From: Sergio Durigan Junior <sergiodj@HIDDEN>
To: Paul Eggert <eggert@HIDDEN>
Subject: Re: bug#14613: [PATCH] Make parse_datetime (and therefore `date')
 handle 'DAY MONTH, YEAR'
References: <alpine.DEB.2.02.1306131813120.3196@HIDDEN>
 <87bo5o8p13.fsf@HIDDEN> <51F43F6D.9000502@HIDDEN>
X-URL: http://sergiodj.net/blog
Date: Sat, 27 Jul 2013 20:13:34 -0300
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 Jul 2013 23:45:17 +0200")
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On Saturday, July 27 2013, Paul Eggert wrote:

> That format is typically considered to be erroneous, e.g.,
> <http://www.grammar.com/dates-day-month-year/>, so I'm
> not sure parse_datetime should be supporting it.

I wasn't aware parse_datetime followed a defined grammar.  And this
seems to be an English grammar idiosyncrasy, which is definitely not
familiar to me (not a native english speaker).

IMO, I don't really see a problem supporting an "erroneous English
grammar", since parse_datetime should probably not be so strict about it
and adapt to such small cases.

Anyway, just my opinion.

-- 
Sergio




Information forwarded to bug-coreutils@HIDDEN:
bug#14613; Package coreutils. Full text available.

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Date: Sat, 27 Jul 2013 23:45:17 +0200
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To: Sergio Durigan Junior <sergiodj@HIDDEN>
Subject: Re: bug#14613: [PATCH] Make parse_datetime (and therefore `date')
 handle 'DAY MONTH, YEAR'
References: <alpine.DEB.2.02.1306131813120.3196@HIDDEN>
 <87bo5o8p13.fsf@HIDDEN>
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That format is typically considered to be erroneous, e.g.,
<http://www.grammar.com/dates-day-month-year/>, so I'm
not sure parse_datetime should be supporting it.




Information forwarded to bug-coreutils@HIDDEN:
bug#14613; Package coreutils. Full text available.

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From: Sergio Durigan Junior <sergiodj@HIDDEN>
To: 14613 <at> debbugs.gnu.org
Subject: [PATCH] Make parse_datetime (and therefore `date') handle 'DAY MONTH,
 YEAR'
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Date: Sat, 27 Jul 2013 04:01:28 -0300
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Hi there,

I have a fix for this issue.  This fix touches Gnulib, but I am sending
it here anyway so you guys can test and make sure it works.

It basically adds a simple production on lib/parse-datetime.y to extend
it in order to correctly handle the proposed date format, i.e., '2 June,
2013'.  It works OK here, but I'd be glad if you could give it a test.
Comments are also obviously welcome.

Thanks,

-- 
Sergio

diff --git a/ChangeLog b/ChangeLog
index 4d73a26..d9d89ad 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2013-07-27  Sergio Durigan Junior  <sergiodj@HIDDEN>
+
+	* lib/parse-datetime.y (date): Add production to handle dates like
+	'27 July, 2013'.  Problem reported for coreutils by Chris F.A.
+	Johnson in <http://bugs.gnu.org/14613>.
+
 2013-07-09  Paul Eggert  <eggert@HIDDEN>
 
 	regex: port to --with-included-regex --enable-gcc-warnings non-threaded
diff --git a/lib/parse-datetime.y b/lib/parse-datetime.y
index 4dce7fa..675ba5c 100644
--- a/lib/parse-datetime.y
+++ b/lib/parse-datetime.y
@@ -535,6 +535,13 @@ date:
         pc->month = $2;
         pc->year = $3;
       }
+  | tUNUMBER tMONTH ',' tUNUMBER
+      {
+        /* e.g. 2 June, 2013.  */
+        pc->day = $1.value;
+	pc->month = $2;
+	pc->year = $4;
+      }
   | iso_8601_date
   ;
 




Information forwarded to bug-coreutils@HIDDEN:
bug#14613; Package coreutils. Full text available.
Severity set to 'wishlist' from 'normal' Request was from Bob Proulx <bob@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Bob Proulx <bob@HIDDEN>
To: "Chris F.A. Johnson" <chris@HIDDEN>
Subject: Re: bug#14613: Date  -- incorrect invalid date
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severity 14613 wishlist
thanks

Chris F.A. Johnson wrote:
> $ date -d '2 June, 2013'
> date: invalid date `2 June, 2013'
> 
>   This should be accepted, just as 'June 2, 2013' is.

Patches to improve the old date parser would always be considered and
appreciated.  The date parser is an old legacy piece of code and has
many known limitations.

Bob




Information forwarded to bug-coreutils@HIDDEN:
bug#14613; Package coreutils. Full text available.

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From: "Chris F.A. Johnson" <chris@HIDDEN>
To: bug-coreutils@HIDDEN
Subject: Date  -- incorrect invalid date
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$ date -d '2 June, 2013'
date: invalid date `2 June, 2013'

   This should be accepted, just as 'June 2, 2013' is.

-- 
    Chris F.A. Johnson, <http://cfajohnson.com/>
    Author:
    Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
    Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)




Acknowledgement sent to "Chris F.A. Johnson" <chris@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-coreutils@HIDDEN. Full text available.
Report forwarded to bug-coreutils@HIDDEN:
bug#14613; Package coreutils. Full text available.
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