dateTag used to create a date input with a JavaScript Calander. See below example:
<field name="eventdate">
<title>Date</title>
<type>dateTag</type>
<searchable />
<hints />
<validation />
<parameters />
<db-attribute>
<attribute name="type">varchar</attribute>
<attribute name="length">15</attribute>
<attribute name="null"></attribute>
<attribute name="default"></attribute>
</db-attribute>
<tag-attributes>
<attribute name="id">eventdate</attribute>
<attribute name="class">app_input</attribute>
</tag-attributes>
</field>