How to modify the system time of Linux

This article mainly explains "how to modify Linux system time". The explanation in this article is simple and clear, easy to learn and understand. Please follow the ideas of Xiaobian and go deep into it slowly to study and learn "how to modify Linux system time" together.

---We usually use the "date -s" command to modify the system time. For example, the command to set the system time to June 10, 1996 is as follows.

#date -s 06/10/96

The command to set the system time to 1:12:00 PM is as follows.

#date -s 13:12:00

---Note that this is system time, Linux is maintained by the operating system.

At system startup, the Linux operating system reads the time from CMOS into the system time variable, and later modifies the time by modifying the system time. To keep system time consistent with CMOS time, Linux writes system time to CMOS at regular intervals. Since this synchronization is performed at intervals (approximately 11 minutes), if we restart the machine immediately after we execute date -s, it is possible that the modified time is not written into CMOS, which is the cause of the problem. To ensure that changes take effect, execute the following command.

---- #clock -w

----This command forces system time to be written to CMOS

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