You can use : date:[2015-04-02T12:50:31.491Z TO 2015-04-03T12:50:31.491Z] in the query toolbar (worked with Kibana 4.1.1)
Pay caution to both end of your range, for example when you search for only 2015 Kibana will give you the 1st of january at 01:00:00.000, I don't know how it will react with a range
EDIT : tried date:[2014 TO 2015], on a vertical bar chart, obtained the log from 31/12/2013 to 01/01/2015 (at 23:00:00.000 each with day interval), I recommand you tu use such chart to experiment with your interval first
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