A text box with placeholder text that disappears by nature

I am looking for a way to structure a text box with placeholder text for a date field. The placeholder text should be xx / xx / xxxx and disappear character by character, leaving slashes in place by type of user. I came across the following two questions that seem to solve the problem when the text disappears right away.

HTML / CSS Creating a text box with a gray color and disappears when I click to enter information, how?

How to preset text box input with tooltip text that disappears upon input (jQuery)

I'm wondering maybe there is a javascript trick or something that can do this.