Follow-up Comment #1, bug #22662 (project findutils):
Yes, the %AX problem is indeed a bug, and thanks for letting
us know about
it.
%AX uses the strftime format %X. That yields the locale's
preferred time
representation:-
$ for locale in POSIX fr_FR.UTF-8 en_IE.UTF-8 en_US.UTF-8;
do printf "%-13s
[%s]n" "$locale" "$(LC_ALL=$locale date
+%X)"; done
POSIX [14:31:09]
fr_FR.UTF-8 [14:31:09]
en_IE.UTF-8 [14:31:09]
en_US.UTF-8 [02:31:09 PM]
It looks like the en_US.UTF-8 locale uses the %r format for
strftime's %X
format. POSIX allows us to determine what format is being
used by calling
nl_langinfo():
$ LC_ALL=en_US.UTF-8 ./locale_time_formats
POSIX locale:
D_T_FMT : [%a %b %e %H:%M:%S %Y]
D_FMT : [%m/%d/%y]
T_FMT : [%H:%M:%S]
en_US.UTF-8 locale:
D_T_FMT : [%a %d %b %Y %r %Z]
D_FMT : [%m/%d/%Y]
T_FMT : [%r]
On the other hand my locale has T_FMT=%T. It should be
safe to append
nanoseconds for formats where T_FMT yields just %S (won't
happen), %T, or %s
(also won't happen), or where the format ends in %S.
If we know the locale is POSIX, we could manually translate
%r to
%I:%M:%S %p so that the %S expands correctly, and we can
probably do that in
all cases for %T.
However, there is another likely bug in the implementation.
It hard-codes
the use of "." as the radix character instead of
using the value of
RADIXCHAR.
However, these things would be hard to document. How about
doing things this
way:
1. In the POSIX locale, the seconds field always includes a
fractional part,
for all formats.
2. In locales other than POSIX, the only fields for which
find will include
nanoseconds are %[ACT]S, %[ACT}+, %[ACT] and
%[ACT]T, and in those cases the
locale's radix character will separate the whole part and
the fractional part.
In locales where the strftime formats %X and %T are
identical, this will
also happen for %[ACT]X. (Here, "%[ACT]X" means
"%AX, %CX or %TX").
3. In other cases the seconds field may lack a fractional
part.
In terms of what will change with respect to 4.4.0:
a) No change in the POSIX locale
b) Change in behaviour of %AX, %CX, %TX for non-POSIX
locales.
c) Use of radix character where appropriate, versus
"." previously.
The upside of this approach is that it is relatively easy to
document and the
behavioural change is small.
A down-side is that it makes it hard for scripts to consume
the output of
%[ACT]X. On the other hand, that output is already hard to
consume since it
has a bug in the 4.4.0 release, and in any case it is
probably better to
specify "%AT %Ap" if that is what you actually
want, rather than "%AX".
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