- timedatectl
root@ip-10-90-10-20:/root> timedatectl
Local time: Thu 2017-03-16 01:54:16 UTC
Universal time: Thu 2017-03-16 01:54:16 UTC
RTC time: Thu 2017-03-16 01:54:16
Time zone: UTC (UTC, +0000)
NTP enabled: yes
NTP synchronized: yes
RTC in local TZ: no
DST active: n/a
root@ip-10-90-10-20:/root>
root@ip-10-90-10-20:/root> systemctl restart systemd-timedated
root@ip-10-90-10-20:/root>
root@ip-10-90-10-20:/root> timedatectl --help
timedatectl [OPTIONS...] COMMAND ...
Query or change system time and date settings.
-h --help Show this help message
--version Show package version
--no-pager Do not pipe output into a pager
--no-ask-password Do not prompt for password
-H --host=[USER@]HOST Operate on remote host
-M --machine=CONTAINER Operate on local container
--adjust-system-clock Adjust system clock when changing local RTC mode
Commands:
status Show current time settings
set-time TIME Set system time
set-timezone ZONE Set system time zone
list-timezones Show known time zones
set-local-rtc BOOL Control whether RTC is in local time
set-ntp BOOL Control whether NTP is enabled
root@ip-10-90-10-20:/root>
ex. 저녁 10시 10분 10초로 변경
timedatactl set-time 22:10:10
ex. 1981년 6월 26일 져녁 9시 20분 15초
timedatactl set-time '1981-06-26 21:20:15'
사용 가능한 타임존 확인
root@ip-10-90-10-20:/root> timedatectl list-timezones
Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
타임존 변경
root@ip-10-90-10-20:/root> timedatectl list-timezones | grep Seoul
Asia/Seoul
root@ip-10-90-10-20:/root> timedatectl set-timezone Asia/Seoul
root@ip-10-90-10-20:/root> timedatectl
Local time: Thu 2017-03-16 11:06:20 KST
Universal time: Thu 2017-03-16 02:06:20 UTC
RTC time: Thu 2017-03-16 02:06:19
Time zone: Asia/Seoul (KST, +0900)
NTP enabled: yes
NTP synchronized: yes
RTC in local TZ: no
DST active: n/a
root@ip-10-90-10-20:/root> timedatectl set-timezone UTC
root@ip-10-90-10-20:/root> timedatectl
Local time: Thu 2017-03-16 02:06:34 UTC
Universal time: Thu 2017-03-16 02:06:34 UTC
RTC time: Thu 2017-03-16 02:06:33
Time zone: UTC (UTC, +0000)
NTP enabled: yes
NTP synchronized: yes
RTC in local TZ: no
DST active: n/a
NTP 활성화
root@ip-10-90-10-20:/root> timedatectl set-ntp yes
- date
root@ip-10-90-10-20:/root> date
Thu Mar 16 02:10:27 UTC 2017
root@ip-10-90-10-20:/root> date --utc
Thu Mar 16 02:14:23 UTC 2017
root@ip-10-90-10-20:/root>
date +"format"
| Control Sequence | Description |
|---|
%H | The hour in the HH format (for example, 17). |
%M | The minute in the MM format (for example, 30). |
%S | The second in the SS format (for example, 24). |
%d | The day of the month in the DD format (for example, 16). |
%m | The month in the MM format (for example, 09). |
%Y | The year in the YYYY format (for example, 2013). |
%Z | The time zone abbreviation (for example, CEST). |
%F | The full date in the YYYY-MM-DD format (for example, 2013-09-16). This option is equal to %Y-%m-%d. |
%T | The full time in the HH:MM:SS format (for example, 17:30:24). This option is equal to %H:%M:%S |
root@ip-10-90-10-20:/root> date +"%Y-%m-%d %H:%M"
2017-03-16 02:16
root@ip-10-90-10-20:/root> date --set HH:MM:SS
root@ip-10-90-10-20:/root> date --set HH:MM:SS --utc
root@ip-10-90-10-20:/root> date --set YYYY-MM-DD
- hwclock
root@ip-10-90-10-20:/root> hwclock
Thu 16 Mar 2017 02:23:00 AM UTC -0.050245 seconds
root@ip-10-90-10-20:/root>
root@ip-10-90-10-20:/root> hwclock --help
Usage:
hwclock [function] [option...]
Functions:
-h, --help show this help text and exit
-r, --show read hardware clock and print result
--set set the RTC to the time given with --date
-s, --hctosys set the system time from the hardware clock
-w, --systohc set the hardware clock from the current system time
--systz set the system time based on the current timezone
--adjust adjust the RTC to account for systematic drift since
the clock was last set or adjusted
-c, --compare periodically compare the system clock with the CMOS clock
--getepoch print out the kernel's hardware clock epoch value
--setepoch set the kernel's hardware clock epoch value to the
value given with --epoch
--predict predict RTC reading at time given with --date
-V, --version display version information and exit
Options:
-u, --utc the hardware clock is kept in UTC
--localtime the hardware clock is kept in local time
-f, --rtc <file> special /dev/... file to use instead of default
--directisa access the ISA bus directly instead of /dev/rtc
--badyear ignore RTC's year because the BIOS is broken
--date <time> specifies the time to which to set the hardware clock
--epoch <year> specifies the year which is the beginning of the
hardware clock's epoch value
--noadjfile do not access /etc/adjtime; this requires the use of
either --utc or --localtime
--adjfile <file> specifies the path to the adjust file;
the default is /etc/adjtime
--test do not update anything, just show what would happen
-D, --debug debugging mode
root@ip-10-90-10-20:/root>
하드웨어 시간을 현재 시스템 시간으로 설정
hwclock --systohc
시스템 시간을 하드웨어 시간으로 설정
gwclock --hctosys