# Creating a new column from existing columns **URL:** \ **Category:** Elasticsearch\ **Created:** [March 12, 2022, 2:33pm UTC](https://discuss.elastic.co/t/creating-a-new-column-from-existing-columns/299528 "2022-03-12T14:33:51Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![carl25en](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/carl25en/32/99840_2.png) [@carl25en](https://discuss.elastic.co/u/carl25en)\ **Post date:** [March 12, 2022, 2:33pm UTC](https://discuss.elastic.co/t/creating-a-new-column-from-existing-columns/299528/1 "2022-03-12T14:33:51Z")
Dear Elasticsearch community, I was wondering how I can create a DateTime column from 5 columns (forecasted\_year,month,day,hour,minute) as it is shown in the image (after creating a new index). I am not sure if this should be done when creating the mapping of the index Thank you! ![recorte](https://us1.discourse-cdn.com/elastic/original/3X/a/5/a5ab416c01cbcc51e86189979059b0bf7695d2be.png) ---
**Author:** ![ylasri](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ylasri/32/86120_2.png) [@ylasri](https://discuss.elastic.co/u/ylasri)\ **Post date:** [March 12, 2022, 5:00pm UTC](https://discuss.elastic.co/t/creating-a-new-column-from-existing-columns/299528/2 "2022-03-12T17:00:40Z")
This should be done at the ingest time Use for example an ingest pipeline to compose and convert a datetime field ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [April 9, 2022, 5:01pm UTC](https://discuss.elastic.co/t/creating-a-new-column-from-existing-columns/299528/3 "2022-04-09T17:01:23Z")
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