When I use JQL below:
project = CLN AND (created >= 2017-08-01 AND created <= 2017-08-04) ORDER BY created DESC
Items with create dates on 2017-08-04 are not included in the search results as I expect they would since I used the <= operator.
However if I use more precision:
project = CLN AND created >= 2017-08-01 AND created <= "2017-08-04 23:59" ORDER BY created DESC
I do get the results I'm looking for. Any ideas why?