Can you enter birthday without year?

I want to capture registrant's birth month and day but not the year.  How can I add this feature to my form?

Please add a Birth Date picker widget:

Then add this css code:

#input_2_year, #sublabel_year

{display:none}

You can test it here:

http://form.jotformpro.com/form/50765452567968? 

Let us know if we can assist you further.