Steps:
1. Create a contact in Gmail with a birth date.
2. Add your Gmail contacts to Evolution (add new Contacts, choose Gmail and fill in your username etc.)
3. Find the new contact (created in Gmail) in Evolution - Contacts - Google - YourCalendar
In my case, the birth date is missing, consistently in all contacts.
4. Try to copy the new contact to you Personal Contacts, you will find that, again, birth date does not show.
Steps:
1. Create a contact in Gmail with a birth date.
2. Add your Gmail contacts to Evolution (add new Contacts, choose Gmail and fill in your username etc.)
3. Find the new contact (created in Gmail) in Evolution - Contacts - Google - YourCalendar
In my case, the birth date is missing, consistently in all contacts.
4. Try to copy the new contact to you Personal Contacts, you will find that, again, birth date does not show.