DateHeader
A container tag whose contents will be displayed if the entry in context was posted on a new day in the list.
Example
<mt:Entries>
<mt:DateHeader>
<h2><$mt:EntryDate format="%A, %B %e, %Y"$></h2>
</mt:DateHeader>
<h3><mt:EntryTitle></h3>
<mt:EntryBody>
</mt:Entries>