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": [
""
]
}
}