setting time

Hello all, A friend (who is by no means a Linux expert and lives at the other end of the world) is using an Archlinux system that has its date and time completely wrong - the year is 2019. Is using timedatectl set-time a safe way to fix this ? In other words, would a system time jump cause problems ? In the hwclock manpage there is a warning that -s (which also causes the system time to jump) should not be used on a running system, this is why I ask. The alternative would be to set the HW clock in the BIOS. If I understand things correctly, the new system time will then be set when booting. TNX, -- FA