As datepicker
The datepicker is based off the default formfield styling. But it should make use of a library in order to generate the months and dates correctly.
<div class="a-formfield js-input-datepicker ">
<div class="a-formfield__wrapper a-formfield__wrapper--with-icon-after ">
<input class="a-formfield__input" type="text" name="datepicker-example-1" id="datepicker-example-1" placeholder="dd/mm/yyyy" value="" />
<span class="a-formfield__icon-after icon-calendar"></span>
</div>
</div>