There is a prototype in time.h

# ifdef __USE_GNU
/* Since `getdate' is not reentrant because of the use of `getdate_err'
   and the static buffer to return the result in, we provide a thread-safe
   variant.  The functionality is the same.  The result is returned in
   the buffer pointed to by RESBUFP and in case of an error the return
   value is != 0 with the same values as given above for `getdate_err'.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int getdate_r (__const char *__restrict __string,
		      struct tm *__restrict __resbufp);
# endif
#endif /* __UCLIBC_MJN3_ONLY__ */

But this function is not enable and not seem developed ?
Is there an addon for this feature? I download also the latest uclibc from git, same issue.

Regards,
Frédéric