Apologies - this is a really stupid question, and I will probably feel even more stupid, once the answer comes...

However, neither in the documentation nor in the forum I found the answer to this simple question.
To provide a list of "expired" members I would like to filter by date in the following format
cb_expiration_date smaller than today's date
For today's date I tried:
- date
- date()
- 'date'
- 'date()'
- var.date
and a few more... Can't think of any others...
Thanks for your help.