# Calculate Duration in JSON input

**URL:** <https://discuss.elastic.co/t/calculate-duration-in-json-input/191691>\
**Category:** Kibana\
**Created:** [July 22, 2019, 5:24pm UTC](https://discuss.elastic.co/t/calculate-duration-in-json-input/191691 "2019-07-22T17:24:19Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![scttwoods](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/scttwoods/32/50673_2.png) [@scttwoods](https://discuss.elastic.co/u/scttwoods)\
**Post date:** [July 22, 2019, 5:24pm UTC](https://discuss.elastic.co/t/calculate-duration-in-json-input/191691/1 "2019-07-22T17:24:19Z")

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I have a data table of individual events with rows split by an event id. I am able to find the min and max of my timestamp field. What I want to do is have a column whose values are the difference between the max and mix times. This requires, as I understand it, aggregation in the json input. Reading through the documentation I could not find an example of applying aggregations in the JSON Input field.

 ![Screenshot%20from%202019-07-22%2010-23-22](https://us1.discourse-cdn.com/elastic/original/3X/3/7/3767b6bfeaeccf3f5bcbd48b562c1d284356dfb1.png)  
I appreciate any insight you all can provide.

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**Author:** ![LizaD](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/lizad/32/51074_2.png) [@LizaD](https://discuss.elastic.co/u/LizaD)\
**Post date:** [July 22, 2019, 9:08pm UTC](https://discuss.elastic.co/t/calculate-duration-in-json-input/191691/2 "2019-07-22T21:08:50Z")

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Hi @scttwoods,

This appears similar to discuss post: [JSON Input arithmetic](https://discuss.elastic.co/t/json-input-arithmetic/191600/2)  
Try visualization time series TSVB using math aggregations. Also cc: @Marius_Dragomir to help further.

Thanks,  
Liza

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<div class="post-metadata">

**Author:** ![scttwoods](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/scttwoods/32/50673_2.png) [@scttwoods](https://discuss.elastic.co/u/scttwoods)\
**Post date:** [July 23, 2019, 6:15pm UTC](https://discuss.elastic.co/t/calculate-duration-in-json-input/191691/3 "2019-07-23T18:15:10Z")

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Unfortunately a time series visual builder that is suggested, is not the correct tool as far as I can see. I want to split by a time independent field to calculate duration using my timestamp field.

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<div class="post-metadata">

**Author:** ![LizaD](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/lizad/32/51074_2.png) [@LizaD](https://discuss.elastic.co/u/LizaD)\
**Post date:** [July 23, 2019, 6:28pm UTC](https://discuss.elastic.co/t/calculate-duration-in-json-input/191691/4 "2019-07-23T18:28:23Z")

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Hi @scttwoods,

Okay let me also add @timroes who is more familiar and hopefully we can get you an answer.

Thanks,  
Liza

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<div class="post-metadata">

**Author:** ![scttwoods](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/scttwoods/32/50673_2.png) [@scttwoods](https://discuss.elastic.co/u/scttwoods)\
**Post date:** [July 25, 2019, 7:24pm UTC](https://discuss.elastic.co/t/calculate-duration-in-json-input/191691/5 "2019-07-25T19:24:08Z")

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Is there any update on my issue?

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<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:** [August 22, 2019, 7:24pm UTC](https://discuss.elastic.co/t/calculate-duration-in-json-input/191691/6 "2019-08-22T19:24:10Z")

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