Sun Java System Web Server 6.1 SP9 NSAPI Programmer's Guide
The system_localtime function is a thread-safe version of the
standard localtime function. It returns the current time in the
local time zone.   struct tm *system_localtime(const time_t *tp,
const struct tm *res);   A pointer to a calendar time (tm)
structure containing the local time. Depending on your system,
the pointer may point to the data item represented by the second
parameter, or it may point to a statically-allocated item. For
portability, do not assume either situation.   time_t *tp is an
arithmetic time.  tm *res is a pointer to a calendar time (tm)
structure.  See Also  system_gmtime, util_strftime