How should user unselect a date from a calender?

1. How do I select a date in HTML?
2. How do I enter a date into a user?

How do I select a date in HTML?

The <input type="date"> defines a date picker. The resulting value includes the year, month, and day.

How do I enter a date into a user?

<input type="date"> <input> elements of type="date" create input fields that let the user enter a date, either with a textbox that validates the input or a special date picker interface. The resulting value includes the year, month, and day, but not the time.