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How to make a date and time picker required? [Template-driven forms]

I have a date and time picker set up like this sample. I now want to make these required as well as disable the submit button when they are not filled in (I know how to do this). Default the fields will be blank. I tried with adding the "required" property onto the input field but that keeps marking the field as invalid. Is it possible to achieve this another way and if so how? 

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