"Use a midpoint for any unknown portion. For instance, if only the year is known, use a date in the middle of the year, and if the datetime is known down to a day, use noon for the time."

Should be https

Add to implentation notes above: "If the exact time is not known, then “00:00:00” should be used. Similarly, the month or day should be 01 if not known."

And change here to 00:00:00

"lack of viewer support for date-aware navigation for single manifests"

consumption only by

Put bit about defaulting to zeroes here.

change to "resources"