Disable option of calender for previous date

hi Mike

thanks for calender in the date field in contact form
i have small request for the contact form, how to disable/block selection of passed dates, that means user cant able to select the previous dates comparing to the current date.

that is today is 4th January user cant select the 3rd january or before that dates.

i am trying to use the form to select the future dates only.

thankks in advance.

https://www.ads-software.com/extend/plugins/si-contact-form/