I think that will still not work. Considering the following:
User1 Birthday: 02/05/1990
Current Date: 02/05/2021
Using the constraint “Birthday = Current date formatted as 02/05/2021” will not get the User1 birthday because of the difference in the year.
As of the moment, my last resort is using advanced filter “Current Date = Birthday change year to current year”. But this one consumes a lot of performance on the client side when dealing with large amount of birthdays to look for. 