strftime lists %x and %X for formatting dates and times in a
locale-specific manner.

atq uses this.  At the moment I'm getting nn/nn/nn style dates, which I
want to change (in my case, to ISO yyyy-mm-dd format).

What do I need to do to do this?  As far as I can tell, this is driven
by the _CurrentTimeLocale pointer in libc, but I can't see anywhere in
the code where that is ever set to anything but _DefaultTimeLocale.

Am I just missing something, or is there really no way to do this short
of either writing the missing locale support or hacking on at.c (or
_def_time.c to change _DefaultTimeLocale)?

(It also looks to me as though at.c assumes it knows, to within a tab
stop, how many characters "%X %x" formatted times take up, which
strikes me as a Bad Thing.)

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