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First install NTP using: yum install -y ntpd (CentOS) or sudo apt install -y ntpd (Ubuntu) Edit the ntp config file.  Under CentOS it is /etc/ntp.conf Find the section where it shows: server 0.centos.pool.ntp.org iburst server 1.centos.pool.ntp.org iburst server 2.centos.pool.ntp.org iburst server 3.centos.pool.ntp.org iburst Comment it out (Adding # at the beginning of each line): # server 0.centos.pool.ntp.org iburst # server 1.centos.pool.ntp.org iburst # server 2.centos.pool.ntp.org iburst # server 3.centos.pool.ntp.org iburst Add the following line (as of 10 Dec 2018 from pool.ntp.org).  No need to put # at the beginning.  For latest server list please go to:  https://www.ntppool.org/zone/hk server stdtime.gov.hk prefer server 2.hk.pool.ntp.org server 2.asia.pool.ntp.org server 0.asia.pool.ntp.org Save the file and exit. Final output: Stop the service first:  systemctl stop ntpd.service After stopping the service, trigger the synchronization by t

To people who have difficulties in finding where is the place to edit your Paypal.me business description and other settings, here is the step by step method with screenshots (Text in Chinese, but the concept should be the same): - Go to Tools > Request for payment (Yes it is super stupid!) - On the bottom right hand corner, you can see (Manage your Paypal.Me Profile) - Click on the top left hand corner "Manage Your Profile":  Info hidden for security purpose. - In your Paypal.me profile, click the "Update" link beside your personal message. - Finally, edit your info and save! One of the most stupid thing is this: you cannot edit your paypal.me profile while clicking the gear icon on top right.  You cannot find any link that allows you to edit your Paypal.me description. There are other stupid thing also: it is difficult to find out where to manage your periodic payments also ( I know where it is finally after searching on Google!).