title: Datetime-local input like duration input
body: <p>I would like to use input which gets from user data about duration in format YYYY-MM-ddThh:mm. Datetime-local input typy uses this format and its easy to use because it holds format. I would like to get from user something like 0000-01-12T10:01. It should be information about duration of validity. Unfortunately Datetime-local input restricts me dates where appears zero months and days. Is possible to turn off this validation?</p>