How to get the entities within the specified DateRange in Selector of CampaignService(v201603)?

I set DateRange (min, max) in Selector of CampaignService(v201603) to retrieve campaigns, while it returned all the results beyond the specified dates. Does the DateRange work, and how can I use the DateRange? And is the date range for startDate, endDate or the changed date of campaigns?  Thanks.

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