7 struct timeval
timeval_plus(struct timeval x, struct timeval y);
8 struct timeval
timeval_diff(struct timeval x, struct timeval y);
struct timeval * gpx_time_to_timeval(const char *time_string)
struct timeval timeval_diff(struct timeval x, struct timeval y)
struct timeval timeval_plus(struct timeval x, struct timeval y)