You can configure DBirthdays module (mod_dbirthdays) to get birth dates from the popular free community component — Community Builder (CB).

By default the module configured to work with CB (if birthday field named cb_birthday). Anyway here you´ll find detailed settings.

At first you must create a field to store users´ birth dates (if you didn´t it before).

• Go to the Community Builder Field Management page
• If you don´t have a birthday field yet — create a new field with type Date, and specify Name, for example cb_birthday
  
• If you has any birthday field already — remember it name
  

Now use specified field name for the parameter Field "Birthday". Go to the module configuration page and specify these values for parameters:

• Table Birthdays: #__comprofiler
• Field "Birthday": cb_birthday
• Field of Identificator: id

• Table Users: #__users
• Field of Identificator: id
• Field "Name": name
• WHERE condition: u.block = 0