隐藏/显示基于下拉值的日期

I made a php page with a search function that has a dropdown menu that includes student, id, registered_date. Now I have a search bar and a date(start date - end date). I want to show the date picker when a user selects registered_date on the dropdown table, but I don't know how. I know for a fact that they use I made a php page with a search function that h