Reply To: Grey out Old (past) dates in date picker?

I have two different forms on my site where the date and time fields unique id differs. Is it possible to include the second unique ID as well?
The reason to have 2 forms is because the Multiselect behaves different on desktop and works fine on phone. Either the user need to press CTRL to select multiple options on Edge browser or Multiselect doesn’t let you to pick multiple options on Chrome browser. SO I created a form with “check boxes” to show on desktop and with “multiselect” on phone devices (This works fine).
It will be great to have Multi select working as I have attached (Example from google). In this case i will be done with just one form for all devices.
Thanks for the supports