A simple auto formatting date input for polymer 2.0
https://www.webcomponents.org/element/LssPolymerElements/titanium-date-input
<titanium-date-input label="My Birthday" auto-validate required error-message="Valid Birthday Required"></titanium-date-input>
git clone https://github.com/LssPolymerElements/titanium-date-input.git
bower install
polymer serve
bower install --save titanium-date-input