Creating a relationship between Date table and Key table

Hello all, I'm fairly new to Power BI and would appreciate some assistence with creating a relationship between my date table and a key table. Below is a screen shot of my data model:

I currently don't have a relationship between my date table and the Query1 table because I would only have specific to the dates that are for whatever date column I've added to Query1. Since I have many different date column from various tables, I'm not sure how to create a relationship between all of those date columns and my date table - assuming I'd use the date column from the date table as my unique key to join on. I've looked up various tutorials on creating a date table, and it appears I need a foreign date key on the Query1 table which I could then use to connect everything. However, I'm not sure if that solution would solve my problem. 

I hope this is enough info, but if not please let me know and I'll be happy to show more.

Thanks!