[Archlinux][ntp] How to execute ntp after reboot automatically

1. To do this in systemd, you can run

systemctl -a | grep ntp

2. to see if ntpdate is enabled. To enable it is just run

systemctl enable ntpdate

Ref :

" How to make ntpd synchronized immediately after reboot?":https://stackoverflow.com/questions/22768194/how-to-make-ntpd-synchronized-immediately-after-reboot