I have created 6 content types that all use the same date field type named "field_date_activity"
For this question let's call them Content1, Content2, Content3, etc.
The date setting is Y, M, D. No hours or minutes. When creating a new node in any of these content types you must select a date.
What I am trying to do is create a Views block that I will put on the Content1 page that displays any found content from Content2, Content3, Content4, etc that matches the "field_date_activity" from Content one.
So what I would have would be