Couple of issues I can see here.
First, the formula looks wrong (in your first screenshot). You are asking for the date picker to be the same as the airtable field when it should be the other way around. The airtable date created should be = date picker
The next issue I can see is, if all date fields are datetime fields, then you won’t be able to match a record because it is looking for an identical timestamp so the records would have to match to the second.
I would use the ‘in between’ option and add another date picker so it would be 'created date is in between date picker 1 and date picker 2.
Let us know if either of these options help