Usage:
 rtcwake [options]

Enter a system sleep state until a specified wakeup time.

Options:
 -a, --auto               reads the clock mode from adjust file (default)
 -A, --adjfile <file>     specifies the path to the adjust file
                            the default is /etc/adjtime
     --date <timestamp>   date time of timestamp to wake
 -d, --device <device>    select rtc device (rtc0|rtc1|...)
 -n, --dry-run            does everything, but suspend
 -l, --local              RTC uses local timezone
     --list-modes         list available modes
 -m, --mode <mode>        standby|mem|... sleep mode
 -s, --seconds <seconds>  seconds to sleep
 -t, --time <time_t>      time to wake
 -u, --utc                RTC uses UTC
 -v, --verbose            verbose messages

 -h, --help               display this help
 -V, --version            display version

For more details see rtcwake(8).