Help validating dates in Vue

I can’t seem to find an answer in Googleland or the forums. Not sure if I’m using the correct terminology or what.

I have a very basic input field in a Vue form. I didn’t install anything, this is just me setting the input type to date.

       class="{ 'border-danger' : this.errors.requested_ship_date }">

Clicking on the date picker works great. However, if I type in a date it allows me to enter too many numbers: 02-12-202002

Can someone point me to a resource for this? I just want to make sure the date format is correct. I don’t have to compare to other dates or time.