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For details about NTP, see xref:../servers/Configuring_NTP_Using_the_chrony_Suite.adoc#ch-Configuring_NTP_Using_the_chrony_Suite[Configuring NTP Using the chrony Suite] and xref:../servers/Configuring_NTP_Using_ntpd.adoc#ch-Configuring_NTP_Using_ntpd[Configuring NTP Using ntpd]. For information about PTP, see xref:../servers/Configuring_PTP_Using_ptp4l.adoc#ch-Configuring_PTP_Using_ptp4l[Configuring PTP Using ptp4l]. For information about setting the hardware clock after executing [application]*ntpdate*, see xref:../servers/Configuring_NTP_Using_ntpd.adoc#s1-Configuring_the_Hardware_Clock_update[Configuring the Hardware Clock Update].
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To customize the output of the [command]#date# command, type:
~]${nbsp}date +"%Y-%m-%d %H:%M"
2013-09-16 17:30
To change the current time, run the [command]#date# command with the [option]`--set` or [option]`-s` option as `root`:
[command]#date# [option]`--set` _HH:MM:SS_
By default, the [command]#date# command sets the system clock to the local time. To set the system clock in UTC, run the command with the [option]`--utc` or [option]`-u` command line option:
[command]#date# [option]`--set` _HH:MM:SS_ [option]`--utc`
~]#{nbsp}date --set 23:26:00
To change the current date, run the [command]#date# command with the [option]`--set` or [option]`-s` option as `root`:
[command]#date# [option]`--set` _YYYY-MM-DD_
~]#{nbsp}date --set 2013-06-02 23:26:00
Using the hwclock Command
`hwclock` is a utility for accessing the hardware clock, also referred to as the Real Time Clock (RTC). The hardware clock is independent of the operating system you use and works even when the machine is shut down. This utility is used for displaying the time from the hardware clock. `hwclock` also contains facilities for compensating for systematic drift in the hardware clock.
The hardware clock stores the values of: year, month, day, hour, minute, and second. It is not able to store the time standard, local time or Coordinated Universal Time (UTC), nor set the Daylight Saving Time (DST).
The `hwclock` utility saves its settings in the `/etc/adjtime` file, which is created with the first change you make, for example, when you set the time manually or synchronize the hardware clock with the system time.
In {MAJOROS}{nbsp}6, the [command]#hwclock# command was run automatically on every system shutdown or reboot, but it is not in {MAJOROSVER}. When the system clock is synchronized by the Network Time Protocol (NTP) or Precision Time Protocol (PTP), the kernel automatically synchronizes the hardware clock to the system clock every 11 minutes.
For details about NTP, see xref:../servers/Configuring_NTP_Using_the_chrony_Suite.adoc#ch-Configuring_NTP_Using_the_chrony_Suite[Configuring NTP Using the chrony Suite] and xref:../servers/Configuring_NTP_Using_ntpd.adoc#ch-Configuring_NTP_Using_ntpd[Configuring NTP Using ntpd]. For information about PTP, see xref:../servers/Configuring_PTP_Using_ptp4l.adoc#ch-Configuring_PTP_Using_ptp4l[Configuring PTP Using ptp4l]. For information about setting the hardware clock after executing [application]*ntpdate*, see xref:../servers/Configuring_NTP_Using_ntpd.adoc#s1-Configuring_the_Hardware_Clock_update[Configuring the Hardware Clock Update].
Running [command]#hwclock# with no command line options as the `root` user returns the date and time in local time to standard output.
[command]#hwclock#
Note that using the [option]`--utc` or [option]`--localtime` options with the [command]#hwclock# command does not mean you are displaying the hardware clock time in UTC or local time. These options are used for setting the hardware clock to keep time in either of them. The time is always displayed in local time. Additionally, using the [command]#hwclock --utc# or [command]#hwclock --local# commands does not change the record in the `/etc/adjtime` file. This command can be useful when you know that the setting saved in `/etc/adjtime` is incorrect but you do not want to change the setting. On the other hand, you may receive misleading information if you use the command an incorrect way. See the `hwclock`(8) manual page for more details.
To display the current date and the current local time from the hardware clock, run as `root`:
~]#{nbsp}hwclock
Tue 15 Apr 2014 04:23:46 PM CEST -0.329272 seconds
CEST is a time zone abbreviation and stands for Central European Summer Time.
For information on how to change the time zone, see xref:Configuring_the_Date_and_Time.adoc#sect-Configuring_the_Date_and_Time-timedatectl-Time_Zone[Changing the Time Zone].
Setting the Date and Time
Besides displaying the date and time, you can manually set the hardware clock to a specific time.
When you need to change the hardware clock date and time, you can do so by appending the [option]`--set` and [option]`--date` options along with your specification:
[command]#hwclock --set --date _"dd mmm yyyy HH:MM"_pass:attributes[{blank}]#
Replace _dd_ with a day (a two-digit number), _mmm_ with a month (a three-letter abbreviation), _yyyy_ with a year (a four-digit number), _HH_ with an hour (a two-digit number), _MM_ with a minute (a two-digit number).
At the same time, you can also set the hardware clock to keep the time in either UTC or local time by adding the [option]`--utc` or [option]`--localtime` options, respectively. In this case, `UTC` or `LOCAL` is recorded in the `/etc/adjtime` file.
Setting the Hardware Clock to a Specific Date and Time
If you want to set the date and time to a specific value, for example, to "21:17, October 21, 2014", and keep the hardware clock in UTC, run the command as `root` in the following format:

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For details about NTP, see xref:../servers/Configuring_NTP_Using_the_chrony_Suite.adoc#ch-Configuring_NTP_Using_the_chrony_Suite[Configuring NTP Using the chrony Suite] and xref:../servers/Configuring_NTP_Using_ntpd.adoc#ch-Configuring_NTP_Using_ntpd[Configuring NTP Using ntpd]. For information about PTP, see xref:../servers/Configuring_PTP_Using_ptp4l.adoc#ch-Configuring_PTP_Using_ptp4l[Configuring PTP Using ptp4l]. For information about setting the hardware clock after executing [application]*ntpdate*, see xref:../servers/Configuring_NTP_Using_ntpd.adoc#s1-Configuring_the_Hardware_Clock_update[Configuring the Hardware Clock Update].
For details about NTP, see xref:../servers/Configuring_NTP_Using_the_chrony_Suite.adoc#ch-Configuring_NTP_Using_the_chrony_Suite[Configuring NTP Using the chrony Suite] and xref:../servers/Configuring_NTP_Using_ntpd.adoc#ch-Configuring_NTP_Using_ntpd[Configuring NTP Using ntpd]. For information about PTP, see xref:../servers/Configuring_PTP_Using_ptp4l.adoc#ch-Configuring_PTP_Using_ptp4l[Configuring PTP Using ptp4l]. For information about setting the hardware clock after executing [application]*ntpdate*, see xref:../servers/Configuring_NTP_Using_ntpd.adoc#s1-Configuring_the_Hardware_Clock_update[Configuring the Hardware Clock Update].
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Source string description
type: delimited block =
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read-only
Source string location
./pages/basic-system-configuration/Configuring_the_Date_and_Time.adoc:361
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a year ago
Last updated
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pot/f27/pages/basic-system-configuration/Configuring_the_Date_and_Time.pot, string 84