How to Set Linux Timezone to CST (Asia/Shanghai) with timedatectl and Manual Methods

Overview

Linux displays local time according to the configured time zone. To set the system to China Standard Time (CST, GMT+8) you can use one of three approaches: the timedatectl utility (recommended on systemd‑based distributions), a manual symbolic link of /etc/localtime, or a temporary TZ environment variable.

Method 1: Use timedatectl (systemd‑based distributions)

Inspect the current configuration timedatectl The output shows Local time , Universal time and Time zone . A typical line for CST is Time zone: Asia/Shanghai (CST, +0800) .

List available zones (optional) timedatectl list-timezones | grep Shanghai The command should return Asia/Shanghai .

Set the zone to CST sudo timedatectl set-timezone Asia/Shanghai Verify the change timedatectl The Time zone line must now read Asia/Shanghai (CST, +0800) . The system clock itself remains in UTC; only the presentation layer is altered.

Method 2: Manually link /etc/localtime (systems without timedatectl )

Backup the existing file sudo mv /etc/localtime /etc/localtime.bak Create a symbolic link to the CST zone data

sudo ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

Confirm the new setting date The displayed time should correspond to GMT+8.

Method 3: Set the TZ environment variable (session‑wide, temporary)

Export the variable in the current shell: export TZ="Asia/Shanghai" Check the result: date The change lasts only for the lifetime of the shell session; a new terminal or a reboot discards it.

Important Considerations

Prefer timedatectl on modern Linux distributions because it updates the kernel’s clock configuration, the /etc/localtime symlink, and notifies services that rely on time.

Ensure the hardware clock (RTC) is set to UTC. The time zone setting does not affect UTC timestamps used by logs and network protocols.

The manual /etc/localtime method is useful for older, non‑systemd systems (e.g., SysVinit or minimal containers) where timedatectl is unavailable.

Using the TZ variable is suitable for one‑off commands or scripts that must run with a specific zone without altering the host configuration.

Reference: https://www.cnblogs.com/guowenrui/p/18577526