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`localtime'--convert time to local representation

     #include <time.h>
     struct tm *localtime(time_t *CLOCK);
     struct tm *localtime_r(time_t *CLOCK, struct tm *RES);
`localtime' converts the time at CLOCK into local time, then converts
its representation from the arithmetic representation to the
traditional representation defined by `struct tm'.
   `localtime' constructs the traditional time representation in static
storage; each call to `gmtime' or `localtime' will overwrite the
information generated by previous calls to either function.
   `mktime' is the inverse of `localtime'.
A pointer to the traditional time representation (`struct tm').
ANSI C requires `localtime'.
   `localtime' requires no supporting OS subroutines.