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Subject: bug#6453: coreutils: date -- Add new options for ISO 8601 date formats (-O)
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From: Jari Aalto <jari.aalto@HIDDEN>
Date: Fri, 18 Jun 2010 10:42:34 +0300
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Package: coreutils
Version: 8.5
Severity: wishlist


I'd like to suggest adding options to cover the typical ISO 8601 dates.
The options "O" seems to be free in date(1) manual page. Suggestions:

    -O      YYYY-MM-DD HH:MM        (possibly most of then used)
    -O::S   YYYY-MM-DD HH:MM:SS
    -O::T   YYYY-MM-DD"T"HH:MM:SS   (The canonical form)

The output can be produced using current option set:

    %Y-%m-%d	1999-12-31
    %Y-%j	1999-365
    %G-W%V-%u	1999-W52-5
    %H:%M:%S	23:59:59

but it would be nice to have a standrd "-O" option set specifically
designed from ISO dates.

Jari

References:

    Standard - Date - ISO 9601 (Markus Kuhn)
    http://www.cl.cam.ac.uk/~mgk25/iso-time.html

    Standard - Date - ISO 8601 (Wikipedia)
    http://en.wikipedia.org/wiki/ISO_8601

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To: Jari Aalto <jari.aalto@HIDDEN>
Subject: bug#6453: Acknowledgement (coreutils: date -- Add new options for
 ISO 8601 date formats (-O))
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Subject: bug#6453: coreutils: date -- Add new options for ISO 8601 date formats (-O)
Resent-From: Eric Blake <eblake@HIDDEN>
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Date: Fri, 18 Jun 2010 08:58:00 -0600
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On 06/18/2010 01:42 AM, Jari Aalto wrote:
> Package: coreutils
> Version: 8.5
> Severity: wishlist
>=20
>=20
> I'd like to suggest adding options to cover the typical ISO 8601 dates.=

> The options "O" seems to be free in date(1) manual page. Suggestions:

Nope, O is already occupied per POSIX:
http://www.opengroup.org/onlinepubs/9699919799/utilities/date.html
For example, %Oe uses different numbers than %e in some locales.
And it is documented in 'date --help' (and therefore the date man page),
under the sentence: O to use the locale's alternate numeric symbols if
available.

> The output can be produced using current option set:
>=20
>     %Y-%m-%d	1999-12-31
>     %Y-%j	1999-365
>     %G-W%V-%u	1999-W52-5
>     %H:%M:%S	23:59:59

Unfortunately, it seems like building the ISO formats from their
components will be be best we can do, as adding % extensions is very
difficult to justify.  However, given that we already have --rfc=3D2822
and --rfc-3339=3DTIMESPEC options that provide shortcuts for building
common RFC layouts, it may make sense to add a new command-line option
--iso-8601=3DTIMESPEC as shortcuts for building common ISO layouts.

> References:
>=20
>     Standard - Date - ISO 9601 (Markus Kuhn)

Did you mean 8601?

--=20
Eric Blake   eblake@HIDDEN    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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Message sent to owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:

Subject: bug#6453: coreutils: date -- Add new options for ISO 8601 date formats (-O)
Resent-From: Eric Blake <eblake@HIDDEN>
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Date: Fri, 18 Jun 2010 11:43:16 -0600
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[let's keep the list/bug-tracker in the loop]

On 06/18/2010 11:31 AM, jari wrote:
> On 2010-06-18 08:58, Eric Blake wrote:
> | > I'd like to suggest adding options to cover the typical ISO 8601 da=
tes.
> |=20
> | Nope, O is already occupied per POSIX:
>=20
> Ok.
>=20
> | common RFC layouts, it may make sense to add a new command-line optio=
n
> | --iso-8601=3DTIMESPEC as shortcuts for building common ISO layouts.
>=20
> That's even better and more straightforward as we need not to remember
> various % flags.=20
>=20
> Nice to know that the feature is considered to be included.

So, before anyone writes such a patch, what TIMESPEC options do you
propose would make the most sense for a new --iso-8601 command-line
option?  And, seeing that RFC 3339 was derived from ISO 8601, do we even
need a new option, or is the existing behavior already present?  In
other words, I'd still like to know what particular shortcuts you feel
are worth adding.

--=20
Eric Blake   eblake@HIDDEN    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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[I repeat - PLEASE keep the list/bug-tracker in the loop, if you expect
anything to be done about your requests]

On 06/18/2010 12:18 PM, jari wrote:
> On 2010-06-18 11:43, Eric Blake wrote:
> | So, before anyone writes such a patch, what TIMESPEC options do you
> | propose would make the most sense for a new --iso-8601 command-line
> | option?  And, seeing that RFC 3339 was derived from ISO 8601, do we e=
ven
> | need a new option, or is the existing behavior already present?  In
> | other words, I'd still like to know what particular shortcuts you fee=
l
> | are worth adding.
>=20
> I'm so used to 8601, so I dind't see the option --rfc-3339 from
> date(1) at first. Here are few commets:
>=20
>=20
>        --rfc-3339=3DTIMESPEC
>               output date and time in RFC 3339 format.
>               TIMESPEC=3D`date', `seconds', or `ns' for date and time t=
o
>               the indicated precision.  Date and time components are
>               separated by a single space: 2006-08-07 12:34:56-06:00
>=20
> Additions to -rfc-3339 option
> -----------------------------
>=20
> Current:
>=20
> 	--rfc-3339=3D"date"	2010-06-18
> 	--rfc-3339=3D"seconds"	2010-06-18 21:08:05+03:00
>=20
> It would be nice to have also without timezone:
>=20
> 	--rfc-3339=3D"time"	2010-06-18 21:08:00	(no TZ)
> 	--rfc-3339=3D"word"	2010-06-18T21:08:00	(single word with seconds)
>=20
> New option --iso8601
> --------------------
>=20
> The 3339 is mostly unknown in the field, but almost everybody
> recognize 8601, so I'd like to suggest a shorthand for the most
> commonly used format (e,g, for log entries):
>=20
> 	--iso8601
>=20
> That would be same as the long option:
>=20
>      	 --rfc-3339=3D"time"
>=20
> Perhaps also "memory friendly":
>=20
> 	--iso8601=3D"tz"
>=20
> Which would be equivalent for:
>=20
>         --rfc-3339=3D"seconds"
>=20
> Jari
>=20
>=20
> =09

--=20
Eric Blake   eblake@HIDDEN    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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