char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy);
void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t);
char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy);
void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t);