Modify the time zone in Linux (1)

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. Clock and hwclock are similar in usage, except that clock commands support both x86 and Alpha hardware systems.

1. date

View system time

# Date

Set system time

# Date -- set = "07/07/06 10:19" month/day/year hour: minute: second)

2. hwclock/clock

View hardware time

# Hwclock -- show

# Clock -- show

Set hardware time

# Hwclock -- set -- date = "07/07/06" month/day/year hour: minute: second)

# Clock -- set -- date = "07/07/06" 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 -- hctosyshc indicates the hardware time, and sys indicates the 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.