# Add New field by Comparing Date

**URL:** <https://discuss.elastic.co/t/add-new-field-by-comparing-date/307895>\
**Category:** Kibana\
**Created:** [June 22, 2022, 2:51pm UTC](https://discuss.elastic.co/t/add-new-field-by-comparing-date/307895 "2022-06-22T14:51:56Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![RahulWagh](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rahulwagh/32/107334_2.png) [@RahulWagh](https://discuss.elastic.co/u/RahulWagh)\
**Post date:** [June 22, 2022, 2:51pm UTC](https://discuss.elastic.co/t/add-new-field-by-comparing-date/307895/1 "2022-06-22T14:51:56Z")

</div>

Hi,  
I am using Kibana v7.17 where I am trying to create new calculated field by comparing the date present in the existing field with hardcoded date.  
For e.g. if(doc['trans\_date'].value \>= "2021-02-15" {emit("FY 2021"}

But here getting error that cannot compare Date with string. How to convert "2021-02-15" to Date type?

---

<div class="post-metadata">

**Author:** ![jsanz](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jsanz/32/53734_2.png) [@jsanz](https://discuss.elastic.co/u/jsanz)\
**Post date:** [June 29, 2022, 12:06pm UTC](https://discuss.elastic.co/t/add-new-field-by-comparing-date/307895/2 "2022-06-29T12:06:27Z")

</div>

Check this page:

> **[Using Datetime in Painless | Painless Scripting Language \[master\] | Elastic](https://www.elastic.co/guide/en/elasticsearch/painless/master/painless-datetime.html)**

This code snippet worked for me:

```auto
String datetime = '2021-02-15T00:00:00Z';
ZonedDateTime zdt = ZonedDateTime.parse(datetime);

ZonedDateTime zdtTo = doc['timestamp'].value;

if ( zdt.isAfter(zdtTo)){
    emit('after');
} else {
    emit('before');
}

```

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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:** [July 27, 2022, 12:06pm UTC](https://discuss.elastic.co/t/add-new-field-by-comparing-date/307895/3 "2022-07-27T12:06:32Z")

</div>

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