Does It really matter what the motivation is?
time being only via ssh
settings stored in /etc/config/system
config timeserver 'ntp'
list server '217.31.202.100'
list server '195.113.144.201'
list server '195.113.144.238'
list server '2001:1488:ffff::100'
list server 'ntp.nic.cz'
list server '0.openwrt.pool.ntp.org'
list server '1.openwrt.pool.ntp.org'
list server '2.openwrt.pool.ntp.org'
list server '3.openwrt.pool.ntp.org'
option enabled '1'
option enable_server '0'