HTML <input type="date" /> elements store the value as an ISO8601 (YYYY-MM-DD) date string, but for us Americans it's very common for us to write the date as m/d/yy.
If you write the value as M/D/YY, that's a valid date but the value becomes 00YY-MM-DD which is an invalid SQL Server date and causes errors when it shouldn't necessarilly.
Adding this directive to any <input type="date" /> should change the value to {CURRENT_FULL_YEAR}-MM-DD automatically if you enter M/D/{LAST_TWO_DIGITS_OF_CURRENT_YEAR}.
Disclaimer - This probably will not work well after the year 9999.