post_install() {
cat << EOT

==================================================================================

you must sync your system clock time (presented both in local time and UTC) as well as the RTC (hardware clock).
Consult https://wiki.archlinux.org/index.php/System_time & https://wiki.archlinux.org/index.php/OpenNTPD

==================================================================================

EOT
}


post_upgrade() {
 post_install
}