Usage: sg_timestamp  [--elapsed] [--help] [--hex] [--milliseconds=MS]
                     [--no-timestamp] [--origin] [--raw] [--readonly]
                     [--seconds=SECS] [--srep] [--verbose] [--version]
                     DEVICE
  where:
    --elapsed|-e       show time as '<n> days hh:mm:ss.xxx' where
                       '.xxx' is the remainder milliseconds. Don't show
                       '<n> days' if <n> is 0 (unless '-e' given twice)
    --help|-h          print out usage message, use twice for examples
    --hex|-H           output response in ASCII hexadecimal
    --milliseconds=MS|-m MS    set timestamp to MS milliseconds since
                               1970-01-01 00:00:00 UTC
    --no-timestamp|-N    suppress output of timestamp
    --origin|-o        show Report timestamp origin (def: don't)
                       used twice outputs value of field
                       0: power up or hard reset; 2: SET TIMESTAMP
    --raw|-r           output Report timestamp response to stdout in
                       binary
    --readonly|-R      open DEVICE read only (def: read/write)
    --seconds=SECS|-s SECS    set timestamp to SECS seconds since
                            1970-01-01 00:00:00 UTC
    --srep|-S          output Report timestamp in seconds (def:
                       milliseconds)
    --verbose|-v       increase verbosity
    --version|-V       print version string and exit

Performs a SCSI REPORT TIMESTAMP or SET TIMESTAMP command. The timestamp
is SET if either the --milliseconds=MS or --seconds=SECS option is given,
otherwise the existing timestamp is reported in milliseconds. The
DEVICE stores the timestamp as the number of milliseconds since power up
(or reset) or since 1970-01-01 00:00:00 UTC which also happens to
be the time 'epoch'of Unix machines.

Use '-hh' (the '-h' option twice) for examples.