How to configure data field with Year only (ex. 2019) format.

Hello. I need to add a form to register ex-alumni, so there is one data field which I need to fill with year only format. (Junior high school / 1990 / 993)
I found this article, but still can’t get it:
https://support.wix.com/es/article/configurando-el-formato-del-campo-fecha-y-hora-en-tu-colecci%C3%B3n-de-base-de-datos
Any help?
I’m adding a picture of the form as I am using it today.

Thank you all in advance.

Might be better to paste the english version of that page so that everybody can read it.
https://support.wix.com/en/article/formatting-the-date-and-time-field-in-your-database-collection

As for having it set as year only, then simply change it to that setting when you do as the page says when you connect the text box element to the dataset link for where you show the chosen datepicker year.