Maken date picker required; how?

Hi there,

Is it possible to make a date-picker field required to fill-in? And how? I have tried several things. Like changing the code, etc. All the solutions in the topic here below doesn’t work for me. Anyone who has an solution?

Topic: https://wordpress.org/support/topic/setting-date-picker-required-doesnt-work?replies=19

Kind regards,
Jordy

https://wordpress.org/plugins/contact-form-7-datepicker/