Markup: templates/output/04-elements/forms/input/date.html
<div class="flex__12 powermail_fieldwrap">
<label for="demoformid-idd">Your Birthday</label>
<input class="" type="date" name="" id="demoformid-idd" value="1970-01-01"/>
</div>
<div class="flex__12 powermail_fieldwrap">
<label for="demoformid-idd-error">Your Birthday</label>
<input class="" type="date" name="" id="demoformid-idd-error" value="1970-01-01"/>
<ul class="powermail-errors-list">
<li>This field is required</li>
</ul>
</div>
Source:
assets/sass/04-elements/_elements.forms.scss
, line 191