I'm seeing an extra Z in the timestamp when the authored timestamp has a Z.
<div class="h-entry"> <time class="dt-published" datetime="2018-03-01T20:45:19Z"></time> </div>
{ "type": [ "h-entry" ], "properties": { "published": [ "2018-03-01T20:45:19ZZ" ], "name": [ "" ] } }