date(1) default format changed between 10.3 and 11.0-BETA3

Julian Elischer julian at
Sat Aug 6 19:08:29 UTC 2016

On 6/08/2016 11:09 PM, Benjamin Kaduk wrote:
> On Sat, 6 Aug 2016, Baptiste Daroussin wrote:
>> On Sat, Aug 06, 2016 at 02:15:36PM +1000, Greg 'groggy' Lehey wrote:
>>> On Friday,  5 August 2016 at 18:56:33 +0300, Andrey A. Chernov wrote:
>>>> On 05.08.2016 18:44, Mark Martinec wrote:
>>>>> On 2016-08-05 17:23, Andrey Chernov wrote:
>>>>> POSIX does say that the default format should be the same
>>>>> as with "+%a %b %e %H:%M:%S %Z %Y".
>>>>> It also says that %a and %b are locale's abbreviated names.
>>>> It is true for _POSIX_ locale only, as I already say. en_US.* is not
>>>> POSIX or C locale.
>>> It still violates POLA.
>> I really do not think that it violates POLA fiven that the behaviour you are
>> expecting is still available in the default configurtion that is still POSIX.
> Regardless, at a new major release is precisely when it is permissible to
> break POLA.
switching from short form to long form is more than a POLA..  short 
form has a specific fixed layout
and feeding a long form string into it will break things.
>> Set LC_TIME to C and then you are back on your behaviour (and this is the
>> default when you install FreeBSD).
>> locales should be seen as tzdata for exemple, they are a moving target
>> complicated to handle for every locale we do support: 78 for 11.0-RELEASE and
>> 193 if we do count the encoding variants. locales are updated very often (for
>> exemple cldr unicode make a new release of the data every 8 month or so)
> As I understand it, your change will improve the maintainability of
> locales in FreeBSD in the future, which justifies a POLA break at the
> release boundary.
> -Ben
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