Read the statement by Michael Teeuw here.
Module: Calendar VCF-Support
I was wondering if I’m the only one who would love to have the possibility to add the birthdays of contacts from CardDAV-server to the calendar module. I have a radicale server which can give me the informations as vcf file. I only have to parse the file and insert into the calender.
Maybe there is an existing solution otherwise I’m starting coding and make a pull request.