CentOS Time View Modify Command date explanation

1. Viewing and modifying the Linux time zone and time

One, the Linux time zone view and the modification

1. View the current time zone
Date-r

2. Modify the setting time zone
Method 1:
Tzselect

Method 2:
Redhat Linux and CentOS only
Timeconfig

Method 3:
Suitable for Debian
Dpkg-reconfigure Tzdata

3. Copy the appropriate time zone file, replace the system time zone file, or create a linked file
cp/usr/share/zoneinfo/$ main time zone/$ times time zone/etc/localtime

Can be used in China:
Cp/usr/share/zoneinfo/asia/shanghai/etc/localtime

Second, the Linux time viewing and modification

1. Check the time and date
Date

2. Set time and date
command to set the system date to June 10, 1996
Date-s 06/10/96

command to set the system time to 1:52 P.M. 0 seconds
Date-s 13:52:00

3. Write the current time and date to the BIOS to avoid failure after reboot
Hwclock-w

Three, timing synchronization time

* * * * * */usr/sbin/ntpdate 210.72.145.44 >/dev/null 2>&1

The commands used in Linux for clock viewing and setup are mainly date, hwclock, and clock.
Among them, clock and hwclock usage similar, only one on the line, but clock command in addition to support x86 hardware system, but also support the Alpha hardware system.

To view Linux system time:
Date

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1. Hwclock–hctosys
2. #或
3. Clock–hctosys

To modify the Linux system time:
Date-s (back and time)

To view Linux hardware time:

Java code
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1. Hwclock
2. #或
3. Clock
4. #或
5. Hwclock–show
6. #或
7. Clock–show

To modify the Linux hardware time:

C code

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1. hwclock–set–date
2. #或
3. clock–set–date

To synchronize the system time with the hardware clock, use:

C code

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1. Hwclock–hctosys
2. #或
3. Clock–hctosys

Instead, let the hardware clock synchronize with the system time:

C code

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1. Hwclock–systohc
2. #或
3. Clock–systohc

Allow the system time to synchronize hardware time every 10 minutes.

C code
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2. [Email protected] root]$ Vi/etc/crontab
4. Shell=/bin/bash
6. Path=/sbin:/bin:/usr/sbin:/usr/bin
8. mailto=Root
10. home=/
12. # Run-parts
14. * * * * * Root run-parts/etc/cron.hourly
16. 4 * * * Root run-parts/etc/cron.daily
18. 4 * * 0 root run-parts/etc/cron.weekly
20. 4 1 * * Root run-parts/etc/cron.monthly
22. */10 * * * * root hwclock--hctosys #加入此行, Hwclock--hctosys every 10 minutes

CentOS Time View Modify Command date explanation