Displays the histogram oddness on dates

Histogram Oddness

// delete the index
curl -XDELETE 'http://localhost:9200/test/'


// create index
curl -XPUT 'http://localhost:9200/test/' -d '
{ 
    index : {
        number_of_shards : 5,
        number_of_replicas : 0
    }
}
'

// put event mapping

curl -XPUT 'http://localhost:9200/test/event/_mapping' -d '
{
    "event" : {
        "properties" : {
            "date_reported" : {"type" : "date"},
            "message" : {"type" : "string", "store" : "yes"}
        }
    }
}
'

// index documents to ES
curl -XPOST 'http://localhost:9200/test/event/' -d '
{
    "date_reported" : "2010-12-13T17:21:09+00:00",
    "message" : "This is a test"
}
'

curl -XPOST 'http://localhost:9200/test/event/' -d '
{
    "date_reported" : "2010-12-16T17:21:09+00:00",
    "message" : "This is a test"
}
'

// get all - both docs are present w/ the proper date/time & tz
curl -XGET 'http://localhost:9200/test/event/_search?pretty=true' -d '
{
    "query" : {
        "match_all" : { }
    }
}
'


// get histo
curl -XGET 'http://localhost:9200/test/event/_search?pretty=true' -d '
{
    "query" : {
        "match_all" : {}
    },
    "facets" : {
        "histo1" : {
            "histogram" : {
                "field" : "date_reported",
                "time_interval" : "12h"
            }
        }
    }
}
'

// 1292241600000 = Mon Dec 13 07:00:00 EST 2010 & 1292500800000 = Thu Dec 16 07:00:00 EST 2010 as expected


curl -XGET 'http://localhost:9200/test/event/_search?pretty=true' -d '
{
    "query" : {
        "match_all" : {}
    },
    "facets" : {
        "histo1" : {
            "histogram" : {
                "field" : "date_reported",
                "time_interval" : "24h"
            }
        }
    }
}
'

//1292198400000 = Sun Dec 12 19:00:00 EST 2010 & 1292457600000 = Wed Dec 15 19:00:00 EST 2010
// When expecting a histo on a full day - why does it shift the days?