View Filter Syntax Question

Hello!
I am trying to figure out if the following is possible: I have certain tasks that have to happen at set intervals, as well as a large number of tasks that just have to happen as soon as I get to them. I’d love to create a view that shows me a) ALL tasks with NO due date, and b) ALL tasks with a due date of TODAY. I was hoping that the following syntax would get me there:

done = false && dueDate = now || dueDate = false

but “false” is not an option for dueDate. Is there documentation anywhere about what acceptable syntax is for filters? On the page where filters are created, it says * Click on the date value in a query to find out more.* , but I can’t figure out precisely what that means.

Thanks!

Okay, I stumbled upon the Upcoming tab, which allows me to see basically what I want but which doesn’t allow me to add anything new. However, I was wondering if I could figure out view settings based on how Upcoming works - it uses the address

http://myserver/tasks/by/upcoming?from=now/d&to=now/d%2B1d&showOverdue=false&showNulls=true

So I was wondering if I could use “showNulls = true” in the filter - unfortunately this does not seem to work. Would love any insight!

Thanks!