Configure NTP

Install ntp:

# pacman -S ntp

Add the following lines in /etc/ntp.conf:

server 0.be.pool.ntp.org iburst
server 1.be.pool.ntp.org iburst
server 2.be.pool.ntp.org iburst
server 3.be.pool.ntp.org iburst

Enable ntpd at startup:

# systemctl enable ntpd