Hello,

I'd like to suggest the following new module: fprintftime-check.
It uses the same infrastructure as fprintftime
(i.e. #include "nstrtime,c") to implement a new function:

   int fprintftime_check (const char *format, const char** err_ptr);

This function enables syntax-check of the format string.
Current implementation of nstrtime/fprintftime silently ignore
bad formats.

With this module, it will be possible to detect/warn/reject
invalid format strings in coreutils' date(1)
( https://bugs.gnu.org/16782 ).

This patch is only a rough draft - everything can be changed (including 
the name).

Comments and feedback welcomed,
  - assaf