how to autocomplete wwith current year if not typed

[Stéphane Mégy]

I'm using a format dd/mm/yyyy. I want to "autocomplete" with the current year if the user type only dd/mm. For example if the user type 30/05 and blur the field (with tab or click), the real date is 30/05/2019.

BTW I know the top "assumeNearbyYear" that transforms 30/12/19  in 30/12/2019 but it'es not exactly what I need