# Elasticsearch offset/time\_zone appears to have no impact over date\_histogram keys

**URL:** <https://discuss.elastic.co/t/elasticsearch-offset-time-zone-appears-to-have-no-impact-over-date-histogram-keys/111341>\
**Category:** Elasticsearch\
**Created:** [December 12, 2017, 1:04pm UTC](https://discuss.elastic.co/t/elasticsearch-offset-time-zone-appears-to-have-no-impact-over-date-histogram-keys/111341 "2017-12-12T13:04:49Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![mjunaidmuzammil](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mjunaidmuzammil/32/56910_2.png) [@mjunaidmuzammil](https://discuss.elastic.co/u/mjunaidmuzammil)\
**Post date:** [December 12, 2017, 1:04pm UTC](https://discuss.elastic.co/t/elasticsearch-offset-time-zone-appears-to-have-no-impact-over-date-histogram-keys/111341/1 "2017-12-12T13:04:49Z")

</div>

Hi,

I am currently working over Elasticsearch version 5.6.5. I encountered a strange problem while working with date\_histogram aggregators.

```
curl -XGET 'localhost:9200'
{
  "name" : "8QffyF_",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "u6ej3wYUQdq3QDrmJoghQQ",
  "version" : {
    "number" : "5.6.5",
    "build_hash" : "6a37571",
    "build_date" : "2017-12-04T07:50:10.466Z",
    "build_snapshot" : false,
    "lucene_version" : "6.6.1"
  },
  "tagline" : "You Know, for Search"
}

```

I inserted one of the dummy documents in ES.

```
curl -XPOST "127.0.0.1:9200/logs_myindex/1" -d '{"timestamp": "2017-01-01T00:00:00"}'

```

After that, I tried getting the aggregations with different values of offset & time\_zone.

```auto
curl -XGET 'localhost:9200/logs_myindex/_search?pretty' -d '{"aggs":{"testAgg":{"date_histogram":{"field":"timestamp","interval":"minute","offset": "+6h"}}},"size":0}'

```

```
{
  "took" : 11,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : 1,
    "max_score" : 0.0,
    "hits" : []
  },
  "aggregations" : {
    "testAgg" : {
      "buckets" : [
        {
          "key_as_string" : "2017-01-01T00:00:00.000Z",
          "key" : 1483228800000,
          "doc_count" : 1
        }
      ]
    }
  }
}

```

Similary, other query with different offset value is returning me the same results.

```
curl -XGET 'localhost:9200/logs_myindex/_search?pretty' -d '{"aggs":{"testAgg":{"date_histogram":{"field":"timestamp","interval":"minute","offset": "+1h"}}},"size":0}'
{
  "took" : 5,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : 1,
    "max_score" : 0.0,
    "hits" : []
  },
  "aggregations" : {
    "testAgg" : {
      "buckets" : [
        {
          "key_as_string" : "2017-01-01T00:00:00.000Z",
          "key" : 1483228800000,
          "doc_count" : 1
        }
      ]
    }
  }
}

```

Can anyone help me out?

---

<div class="post-metadata">

**Author:** ![jpountz](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jpountz/32/45836_2.png) [@jpountz](https://discuss.elastic.co/u/jpountz)\
**Post date:** [December 12, 2017, 5:12pm UTC](https://discuss.elastic.co/t/elasticsearch-offset-time-zone-appears-to-have-no-impact-over-date-histogram-keys/111341/2 "2017-12-12T17:12:58Z")

</div>

This is expected. The `offset` parameter causes Elasticsearch to compute the bucket for `timestamp-offset` before adding `offset` from the computed bucket.

Say your timestamp is `2017-01-01T12:34:56`, first we subtract 6 hours, this gives `2017-01-01T6:34:56`, then we round to the minute, which gives `2017-01-01T6:34:00` and finally we add back 6 hours, which gives `2017-01-01T12:34:00`.

The offset parameter has no effect if it is a multiple of your interval. In your case, since your interval is 1 minute, you would need it to be between 0 and 1 minute for it to have an effect.

Similarly the timezone parameter only has an effect if the time interval is at least `day` since it only shifts hours.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 9, 2018, 5:13pm UTC](https://discuss.elastic.co/t/elasticsearch-offset-time-zone-appears-to-have-no-impact-over-date-histogram-keys/111341/3 "2018-01-09T17:13:29Z")

</div>

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