How does one modify the time zone and time on a Linux server?
Linux Clock is divided into System Clock and Real Time Clock (RTC. The system clock is the current Linux Kernel clock, and the hardware clock is the battery-powered clock on the motherboard. This hardware clock can be set in the BIOS. When Linux is started, the hardware clock reads the system clock settings, and then the system clock runs independently of the hardware.
All commands (including functions) in Linux use the system clock settings. In Linux, the commands used for clock viewing and setting mainly include date, hwclock, and clock. Among them, clock and hwclock use similar, just use one line, but clock commands not only support x86 hardware system, but also support Alpha hardware system.
1. date
View system time
# Date
Set system time
# Date-s "01/05/15" (month/day/year hour: minute: second)
2. hwclock/clock
View hardware time
# Hwclock -- show
Or # clock -- show
Set hardware time
# Hwclock -- set -- date = "01/05/15 13:19" (month/day/year hour: minute: second)
Or # clock -- set -- date = "01/05/15 13:19" (month/day/year hour: minute: second)
3. Hardware time and System Time Synchronization
As mentioned earlier, when the system is restarted, the hardware time reads the system time for synchronization. However, if the system time is not restarted, you need to use the hwclock or clock command to synchronize data.
Hardware clock and system clock synchronization: # hwclock -- hctosys (hc indicates hardware time, sys indicates system time) or # clock -- hctosys
System clock and hardware clock synchronization: # hwclock -- systohc or # clock-systohc
4. Time Zone settings
# Tzselect
Please identify a location so that time zone rules can be set correctly. Please select a continent or ocean
1) Africa
2) Americas
3) Antarctica
4) Arctic Ocean
5) Asia
6) Atlantic Ocean
7) Australia
8) Europe
9) Indian Ocean
10) Pacific Ocean
11) none-I want to specify the time zone using the Posix TZ format.
Input 5, Asia
Please select a country
1) Afghanistan
18) Israel
35) Palestine
2) armenia
19) Japan
36) Philippines
3) Azerbaijan
20) Jordan
37) Qatar
4) Bahrain
21) Kazakhstan
38) Russia
5) Bangladesh
22) Korea (North)
39) Saudi Arabia
6) Bhutan
23) Korea (South)
40) Singapore
7) Brunei
24) Kuwait
41) Sri Lanka
8) Cambodia
25) Kyrgyzstan
42) Syria
9) China
26) Laos
43) Taiwan
10) Cyprus
27) Lebanon
44) Tajikistan
11) East Timor
28) Macau
45) Thailand
12) Georgia
29) Malaysia
46) Turkmenistan
13) Hong Kong
30) Julia
47) United Arab Emirates
14) India
31) Myanmar (Burma)
48) Uzbekistan
15) Indonesia
32) Nepal
49) Vietnam
16) Iran
33) Oman
50) Yemen
17) Iraq
34) Pakistan
Enter 9, China
Please select one of the following time zone regions
1) east China-Beijing, Guangdong, Shanghai, etc.
2) Heilongjiang
3) central China-Gansu, Guizhou, Sichuan, Yunnan, etc.
4) Tibet & most of Xinjiang Uyghur
5) southwest Xinjiang Uyghur
Enter 1, Beijing time
The following information has been given:
China east China-Beijing, Guangdong, Shanghai, etc
Therefore TZ = "Asia/Shanghai" will be used. Local time is now: Fri Jul 7 10:32:18 CST 2006. Universal Time is now: Fri Jul 7 02:32:18 UTC 2006.Is the above information OK? 1) Yes2) No
Enter 1, OK
If you do not need the tzselect command, you can modify the time zone of the file.
# Vi/etc/sysconfig/clock ZONE = Asia/Shanghai (Query files under/usr/share/zoneinfo) UTC = false ARC = false
# Rm/etc/localtime
# Ln-sf/usr/share/zoneinfo/Asia/Shanghai/etc/localtime
Restart.
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