Quartz does not set the date properly
Quartz's documentation says the following:
Syntax, Authoring Content, Quartz Documentation:
date: A string representing the day the note was published. Normally usesYYYY-MM-DDformat.
This works if defaultDateType is set
to created. However, you might find
that all of the dates are not set correctly if you
change the defaultDateType to
modified or published.
This is because for these date types, the date is
actually read from different fields in the default
CreatedModifiedDate plugin. For
modified, the field is read from
lastmod, updated, or
last-modified. For
published, the date is read from
publishDate.