At the moment, the time stamps on li.wiktionary.org are in UTC. However, the entire linguistic area lies in Belgium, Netherlands and Germany. As such it should use CET/CEST, as does li.wikipedia.org.
See also local discussion: https://li.wiktionary.org/w/index.php?title=Wiktionary:In_%27t_nuujs&oldid=694954#Tied
I hope this is something that can be easily fixed. Thank you in advance!