Birth Date located in Zoho Mail Contacts Section

Birth Date located in Zoho Mail Contacts Section

I am being forced to put a birth year if I want to add a birth date to her Contact in Zoho Mail.  I do not know nor would I care to ask my contacts for this information.  I don't see a way to leave the year as blank.

Is there a way for us to modify the birth date to reflect Month and Date only?