[Bug time/29460] New: strptime() doesn't support strftime() %P format

["yann at droneaud dot fr" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29460

            Bug ID: 29460
           Summary: strptime() doesn't support strftime() %P format
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: time
          Assignee: unassigned at sourceware dot org
          Reporter: yann at droneaud dot fr
  Target Milestone: ---

Created attachment 14266
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14266&action=edit
strftime(), strptime() %P format test

Despite being documented as supported alias to %p, %P is not known to
strptime()

https://www.gnu.org/software/libc/manual/html_node/Low_002dLevel-Time-String-Parsing.html

> %p
> %P
> 
>     The locale-dependent equivalent to ‘AM’ or ‘PM’.
> 
>     This format is not useful unless %I or %l is also used. Another complication is that the locale might not define these values at all and therefore the conversion fails.
> 
>     %P is a GNU extension following a GNU extension to strftime.

https://man7.org/linux/man-pages/man3/strptime.3.html

>     Similarly, because of GNU extensions to strftime(3), %k is
>     accepted as a synonym for %H, and %l should be accepted as a
>     synonym for %I, and %P is accepted as a synonym for %p.

The attached test case produced the following output:

    strftime() produced "am"
    strptime() failed to parse "am"
    strftime() produced "pm"
    strptime() failed to parse "pm"


Fixes for https://sourceware.org/bugzilla/show_bug.cgi?id=4772 is incomplete.

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