DateTime valueAsDate

Source 

@DomName('HTMLInputElement.valueAsDate')
@DocsEditable()
DateTime get valueAsDate =>
    _blink.BlinkHTMLInputElement.instance.valueAsDate_Getter_(this);
void valueAsDate=(DateTime value)

Source 

@DomName('HTMLInputElement.valueAsDate')
@DocsEditable()
set valueAsDate(DateTime value) =>
    _blink.BlinkHTMLInputElement.instance.valueAsDate_Setter_(this, value);