# Aggregation for number of days since X

**URL:** <https://discuss.elastic.co/t/aggregation-for-number-of-days-since-x/223945>\
**Category:** Elasticsearch\
**Tags:** docker\
**Created:** [March 17, 2020, 2:05pm UTC](https://discuss.elastic.co/t/aggregation-for-number-of-days-since-x/223945 "2020-03-17T14:05:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Keef\_Baker](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/keef_baker/32/64592_2.png) [@Keef\_Baker](https://discuss.elastic.co/u/Keef_Baker)\
**Post date:** [March 17, 2020, 2:05pm UTC](https://discuss.elastic.co/t/aggregation-for-number-of-days-since-x/223945/1 "2020-03-17T14:05:43Z")

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Hi,

I have a bunch of data and each element has a timestamp field. What I'm wanting to do is get the median for the number of days since that datestamp for all that data (preferably in days)

I can get the data out fine, but it's the number of days since I'm having problems with, are there any time based options for aggregations in Elasticsearch for a query like this?

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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:** [April 14, 2020, 2:05pm UTC](https://discuss.elastic.co/t/aggregation-for-number-of-days-since-x/223945/2 "2020-04-14T14:05:44Z")

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