char *format_timestamp(char *buf, size_t l, usec_t t);
// UNNEEDED char *format_timestamp_utc(char *buf, size_t l, usec_t t);
char *format_timestamp_us(char *buf, size_t l, usec_t t);
char *format_timestamp(char *buf, size_t l, usec_t t);
// UNNEEDED char *format_timestamp_utc(char *buf, size_t l, usec_t t);
char *format_timestamp_us(char *buf, size_t l, usec_t t);