I been trying to figure out how to add date picker in checkout. I can add date picker by plugin but I am not sure if that is correct way. I was expecting this to be done through knockout js but I couldn’t get anywhere with it Is it possible I could get the value of date picker to Database
Unfortunately modifying the checkout is one of the hardest things to achieve. You need to so several things.
Take a look at this extension
https://github.com/sohelrana09/magento2-module-delivery-date/tree/master/SR/DeliveryDate
Date field too.
Or perhaps mine as a start
https://github.com/DominicWatts/OrderComment
It's a text field but demonstrates what you need to do to get it to save