Martin Matějek authored Jan 11, 2023 and Martin Matějek committed May 09, 2023

odhcpd reports DHCPv6 lease time in seconds => meaning lease time
duration. Which is unfortunately treated as unix timestamp in reForis
Lan page (e.g. 1970-01-01 <some time>).

DHCPv4 lease time, on the other hand, is reported as timestamp of end of
the lease (e.g. 2022-01-11 20:41).

Unify lease time format for both DHCPv4/6 to the "end of the lease"
format.

Closes: #258