Record the execution steps of the calibration time operation:
First use date to see if the current time is accurate
Calibration time command
ntpdate cn.pool.ntp.org
If you don't have permission:
sudo -i
Enter the password will appear, enter the password directly
Execute the calibration time operation command again
ntpdate cn.pool.ntp.org
After the operation is complete, check whether the time is accurate
date