One of my colleague overridden the Checkout module as per the client requirement. Now, I want to add a date picker field into the checkout but I don't know how to do it.
We would like to have a date picker field as there should be a possibility to edit the field by clicking a text "Change delivery date". When clicking on this link a calendar should display which showing the week numbers. The customer should be able to choose the preferred delivery date.
Could anyone please help me with this?