-A

Specify an alternative path to the adjust file.

-a

Read the clock mode (whether the hardware clock is set to UTC or local time) from the adjtime file,where hwclock(8) stores that information. This is the default.

--date

Set the wakeup time to the value of the timestamp. Format of the timestmap can be any of the follow‐ing:YYYYMMDDhhmmssYYYY-MM-DD hh:mm:ssYYYY-MM-DD hh:mm (seconds will be set to 00)YYYY-MM-DD (time will be set to 00:00:00)hh:mm:ss (date will be set to today)hh:mm (date will be set to today, seconds to 00)tomorrow (time is set to 00:00:00)+5min

-d

Use the specified device instead of rtc0 as realtime clock. This option is only relevant if your sys‐tem has more than one RTC. You may specify rtc1, rtc2, ... here.

-l

Assume that the hardware clock is set to local time, regardless of the contents of the adjtime file.

--list-modes

List available --mode option arguments.

-m

Go into the given standby state. Valid values for mode are:standbyACPI state S1. This state offers minimal, though real, power savings, while providing a verylow-latency transition back to a working system. This is the default mode.freeze The processes are frozen, all the devices are suspended and all the processors idled. Thisstate is a general state that does not need any platform-specific support, but it saves lesspower than Suspend-to-RAM, because the system is still in a running state. (Available sinceLinux 3.9.)mem ACPI state S3 (Suspend-to-RAM). This state offers significant power savings as everything inthe system is put into a low-power state, except for memory, which is placed in self-refreshmode to retain its contents.disk ACPI state S4 (Suspend-to-disk). This state offers the greatest power savings, and can be usedeven in the absence of low-level platform support for power management. This state operatessimilarly to Suspend-to-RAM, but includes a final step of writing memory contents to disk.off ACPI state S5 (Poweroff). This is done by calling '/sbin/shutdown'. Not officially supportedby ACPI, but it usually works.no Don't suspend, only set the RTC wakeup time.on Don't suspend, but read the RTC device until an alarm time appears. This mode is useful fordebugging.disableDisable a previously set alarm.show Print alarm information in format: "alarm: off|on <time>". The time is in ctime() output for‐mat, e.g. "alarm: on Tue Nov 16 04:48:45 2010".

-n

This option does everything apart from actually setting up the alarm, suspending the system, or waitingfor the alarm.

-s

Set the wakeup time to seconds in the future from now.

-t

Set the wakeup time to the absolute time time_t. time_t is the time in seconds since 1970-01-01, 00:00UTC. Use the date(1) tool to convert between human-readable time and time_t.

-u

Assume that the hardware clock is set to UTC (Universal Time Coordinated), regardless of the contentsof the adjtime file.

-V

Display version information and exit.

-h

Display help text and exit.NOTESSome PC systems can't currently exit sleep states such as mem using only the kernel code accessed by thisdriver. They need help from userspace code to make the framebuffer work again.FILES/etc/adjtimeHISTORYThe program was posted several times on LKML and other lists before appearing in kernel commit message forLinux 2.6 in the GIT commit 87ac84f42a7a580d0dd72ae31d6a5eb4bfe04c6d.AUTHORSThe program was written by David Brownell <dbrownell@users.sourceforge.net> and improved by Bernhard Walle<bwalle@suse.de>.COPYRIGHTThis is free software. You may redistribute copies of it under the terms of the GNU General Public License<http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.