Hi @Lpapolu
I am not sure how you create a date column from a related table. Usually, the lookup will pickup a primary column from another table. Please clarify.
If it is a date column with the modern list, I have checked the filter which is working well.
Hope it helps.
------------
If you like this post, give it a Thumbs up. Where it solved your request, Mark it as a Solution to enable other users to find it.