Time or DateTime in Spec. 0.9

[Kless]

I've seen that in the next ones fields is used Time, but I think that
it should be indicated DateTime:

* http://wiki.opensocial.org/index.php?title=Opensocial.Activity_(v0.9)

opensocial.Activity.Field.POSTED_TIME
time -> datetime

* http://wiki.opensocial.org/index.php?title=Opensocial.MediaItem_(v0.9)

opensocial.MediaItem.Field.CREATED
time -> datetime

opensocial.MediaItem.Field.LAST_UPDATED
time -> datetime

* http://wiki.opensocial.org/index.php?title=Opensocial.Message_(v0.9)

opensocial.Message.Field.TIME_SENT
time -> datetime