You might also try the EE's native bday_m, bday_d, and bday_y fields. The documentation only mentions the combined {birthday} tag, but the month / day / year values are stored separately in the database and are accessible via {bday_m}, {bday_d}, and {bday_y}.

To use these tags, you must be within {exp:member:custom_profile_data}, or you could use an alternative, such as Profile:edit ($49, mentioned by @Siebird above).

I know this answer isn't specific to CT, but it may accomplish what you're after.

You might also try the EE's native bday_m, bday_d, and bday_y fields. The documentation only mentions the combined {birthday} tag, but the month / day / year values are stored separately in the database and are accessible via {bday_m}, {bday_d}, and {bday_y}.

To use these tags, you must be within {exp:member:custom_profile_data}, or you could use an alternative, such as Profile:edit ($49, mentioned by @Siebird above).

I know this answer isn't specific to CT, but it may accomplish what you're after.