Posix_time2.TimevalPOSIX timeval time value with seconds and microseconds. A normalized value of type t must have a value of tv_usec between 0 and 1000000 (exclusive).
val create : int64 -> int64 -> tcreate sec usec creates a new normalized timespec with sec seconds and usec microseconds.
val to_string : t -> stringto_string t creates a string of the form "sec.usec".