# Add day in Add fields

**URL:** <https://discuss.elastic.co/t/add-day-in-add-fields/333164>\
**Category:** Kibana\
**Created:** [May 11, 2023, 7:27am UTC](https://discuss.elastic.co/t/add-day-in-add-fields/333164 "2023-05-11T07:27:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![M.Naim](https://avatars.discourse-cdn.com/v4/letter/m/54ee81/32.png) [@M.Naim](https://discuss.elastic.co/u/M.Naim)\
**Post date:** [May 11, 2023, 7:27am UTC](https://discuss.elastic.co/t/add-day-in-add-fields/333164/1 "2023-05-11T07:27:20Z")

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Hi All,

I am trying to add a derived date field by adding days into exiting date fields using the below query.

```auto
ZonedDateTime origValue = doc['body.dates.dispenseDate'].value;
ZonedDateTime newValue = origValue.plusDays(2);
emit(newValue);

```

Error: class\_cast\_exception: Cannot cast from [java.time.ZonedDateTime] to [long].

Please help into

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/1/5/15d08f8b05761b624614c2cb8e3c45be924beaac.png)

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<div class="post-metadata">

**Author:** ![jughosta](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jughosta/32/107160_2.png) [@jughosta](https://discuss.elastic.co/u/jughosta)\
**Post date:** [May 22, 2023, 6:35pm UTC](https://discuss.elastic.co/t/add-day-in-add-fields/333164/2 "2023-05-22T18:35:03Z")

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Hi @M.Naim,

I am not familiar with `ZonedDateTime` but converting `newValue` to milliseconds or ISO formatted date string should help.

> **[Date field type | Elasticsearch Guide \[8.7\] | Elastic](https://www.elastic.co/guide/en/elasticsearch/reference/current/date.html)**

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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:** [June 19, 2023, 6:35pm UTC](https://discuss.elastic.co/t/add-day-in-add-fields/333164/3 "2023-06-19T18:35:19Z")

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