Linux modification Time

2. Modify the system time.

   There are two Linux system clocks, one is the hardware clock, that is, the BIOS time, which is the time we see in CMOS setup, and the other is the system clock, which is the kernel time of the Linux system. When Linux starts, the system kernel reads the hardware clock settings, and the system clock is independent of the hardware. Sometimes we find that the system clock is inconsistent with the hardware clock, so we need to perform time synchronization and share the command usage of time settings and clock synchronization.

   The date command sets the dates to June 18, 2014

   ----Date-s 06/18/14

   Set the time to 14 points, 20 minutes, 50 seconds

   ----Date-s 14:20:50

   Set the time to June 18, 2014 14:16 30 seconds (MMDDHHMMYYYY.SS)

   ----Date 0618141614.30

4. Hwclock/clock command to view, set hardware time

   Viewing the system hardware clock

   Hwclock--show or

   Clock--show

   Set Hardware time

   Hwclock--set--date= "06/18/14 14:55" (Month/day/year: minutes: seconds) or # clock--set--date= "06/18/14 14:55" (Month/day/year: minutes: seconds)

6. Synchronous system and hardware clock.

   You can see that the hardware and system clocks differ by half an hour. can be synchronized using hwclock or clock,

   The hardware clock is synchronized with the system clock:

   # Hwclock--hctosys or # clock--hctosys HC represents the hardware time, SYS represents the system time, i.e. the system clock is synchronized with the hardware clock

   system clock and Hardware clock synchronization:

   # Hwclock--SYSTOHC or # clock--SYSTOHC synchronize hardware clock with system clock

   
   

Linux modification Time