# Field dynamics kibana Painless

**URL:** <https://discuss.elastic.co/t/field-dynamics-kibana-painless/337799>\
**Category:** Kibana\
**Tags:** painless\
**Created:** [July 6, 2023, 12:54pm UTC](https://discuss.elastic.co/t/field-dynamics-kibana-painless/337799 "2023-07-06T12:54:31Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![francieliton\_araujo](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/francieliton_araujo/32/47771_2.png) [@francieliton\_araujo](https://discuss.elastic.co/u/francieliton_araujo)\
**Post date:** [July 6, 2023, 12:54pm UTC](https://discuss.elastic.co/t/field-dynamics-kibana-painless/337799/1 "2023-07-06T12:54:32Z")

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hello, can you help me?  
I have a field containing the time of a possible solution to a demand and I would like to create a dynamic field that counts how much time is left to overflow type:  
''' now() - doc['forecast'].value '''  
in second

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**Author:** ![nickpeihl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nickpeihl/32/112622_2.png) [@nickpeihl](https://discuss.elastic.co/u/nickpeihl)\
**Post date:** [July 7, 2023, 4:14pm UTC](https://discuss.elastic.co/t/field-dynamics-kibana-painless/337799/2 "2023-07-07T16:14:06Z")

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Hi @francieliton_araujo. `now()` is not available in Painless because `now()` creates a different time for every field. [Our documentation](https://www.elastic.co/guide/en/elasticsearch/painless/8.8/painless-datetime.html#_datetime_now) suggests passing a `now` parameter to the script. But the value for that parameter must be generated outside of the query. So I don't think it's possible to do what you are asking.

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**Author:** ![nickpeihl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nickpeihl/32/112622_2.png) [@nickpeihl](https://discuss.elastic.co/u/nickpeihl)\
**Post date:** [July 7, 2023, 4:57pm UTC](https://discuss.elastic.co/t/field-dynamics-kibana-painless/337799/3 "2023-07-07T16:57:54Z")

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Are you trying to create a visualization? Maybe we can find some other way to accomplish this without a runtime field. For example, Kibana v8.9 (coming soon) adds support for (among other things) a [`now()` function for Lens formulas](https://github.com/elastic/kibana/pull/158452).

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 4, 2023, 4:58pm UTC](https://discuss.elastic.co/t/field-dynamics-kibana-painless/337799/4 "2023-08-04T16:58:23Z")

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