Field Definitions are Available Here
Collection
date
Optional
The ending date of the campaign.
29265
CampaignShortName, CampaignLongName, CampaignStartDate
29265
Must be used with CampaignShortName
METADATA > COLLECTIONMETADATA > Campaign > CampaignContainer.CampaignEndDate
Campaign temporal information would seem more appropriate in metadata for the campaign rather than in metadata for a collection that is part of the campaign
Temporal Information