[Milhouse]

pool.ntp.org is a cluster that dynamically resolves to multiple addresses for timeservers appropriate for your region - in effect, a load balancer, of sorts. See http://www.pool.ntp.org/en/use.html

Even if your router is configured to use pool.ntp.org, what timeserver is your LibreELEC client configured to use - is LE being configured (by DHCP) to use pool.ntp.org, or is it using your router (ie. 192.168.0.x) as the timeserver? If the latter, is the ntpd daemon working correctly in your router? Is the time on your router accurate?

In LE, try (where 192.168.0.x is your router address):

Code:

ntpd -wqd -p pool.ntp.org
ntpd -wqd -p 0.pool.ntp.org -p 1.pool.ntp.org -p 2.pool.ntp.org -p 3.pool.ntp.org
ntpd -wqd -p 192.168.0.x

and see if you get valid replies, or timeouts (ctrl-c to end each run). Each time you run ntpd for pool.ntp.org you should query a different timeserver (0.pool.ntp.org etc. will also be random).