Set minimum date

Hello I am trying to set a minimum time at the date-picker. I want to set a restriction that the user will not be able to pick a date from the past.
I have read the following post but the min-date:0]’ didn’t worked.
https://ww.wp.xz.cn/support/topic/set-todays-date-to-minimum-date?replies=9

https://ww.wp.xz.cn/plugins/contact-form-7/