59 lines
1.2 KiB
Markdown
59 lines
1.2 KiB
Markdown
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---
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layout: default
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title: Date histogram
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parent: Bucket aggregations
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grand_parent: Aggregations
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nav_order: 20
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---
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# Date histogram aggregations
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The `date_histogram` aggregation uses [date math]({{site.url}}{{site.baseurl}}/opensearch/supported-field-types/date/#date-math) to generate histograms for time-series data.
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For example, you can find how many hits your website gets per month:
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```json
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GET opensearch_dashboards_sample_data_logs/_search
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{
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"size": 0,
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"aggs": {
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"logs_per_month": {
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"date_histogram": {
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"field": "@timestamp",
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"interval": "month"
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}
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}
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}
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}
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```
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#### Example response
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```json
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...
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"aggregations" : {
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"logs_per_month" : {
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"buckets" : [
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{
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"key_as_string" : "2020-10-01T00:00:00.000Z",
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"key" : 1601510400000,
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"doc_count" : 1635
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},
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{
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"key_as_string" : "2020-11-01T00:00:00.000Z",
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"key" : 1604188800000,
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"doc_count" : 6844
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},
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{
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"key_as_string" : "2020-12-01T00:00:00.000Z",
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"key" : 1606780800000,
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"doc_count" : 5595
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}
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]
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}
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}
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}
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```
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The response has three months worth of logs. If you graph these values, you can see the peak and valleys of the request traffic to your website month over month.
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