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.