Date formatting with en_US locale

Baptiste and -current,

I noticed two annoyances with date formatting on head, and I wonder how
we can fix them.

I have these settings:

    LC_ALL=en_US.ISO8859-1
    LANG=en_US.ISO8859-1

First, Thunderbird displays the date as, for example:

    03/ 6/16 ...

The leading space on the day (6) looks weird.  I might even say it's
simply wrong.  Zero-padding would better.  (/No/ padding would be best,
but I don't think strftime supports that.)

Second, date(1) no longer shows the day-of-week:

    $ date
    March 26, 2016 at 09:21:55 AM CDT

For many years, I have been typing "date" to see the day-of-week (and
other things).  I like the new human-friendly format, but I miss the
day-of-week.

Of course, I can fix these locally, but I wonder how we can fix them for
everyone.  I see that the formats come from CLDR.  I also see that ume_at_
restored the day-of-week for ja_JP in r292512.  Is this the best
approach, or should we try to get them changed upstream (CLDR)?

Thanks for your input,

Eric