# Date parse failed on kibana index update

**URL:** <https://discuss.elastic.co/t/date-parse-failed-on-kibana-index-update/188821>\
**Category:** Kibana\
**Created:** [July 4, 2019, 2:29am UTC](https://discuss.elastic.co/t/date-parse-failed-on-kibana-index-update/188821 "2019-07-04T02:29:23Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![queenstownswords](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/queenstownswords/32/49399_2.png) [@queenstownswords](https://discuss.elastic.co/u/queenstownswords)\
**Post date:** [July 4, 2019, 2:29am UTC](https://discuss.elastic.co/t/date-parse-failed-on-kibana-index-update/188821/1 "2019-07-04T02:29:23Z")

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Hello,

ELK 7.2.0  
Windows  
I am using the 8.0 Upgrade assistant in Kibana.  
It appears that a MM argument without the leading 0 gives an index warning but the upgrade assistant (parser) cannot handle it.  
I am getting the following error from the upgrade assistant:

{"type":"illegal\_argument\_exception","reason":"failed to parse date field [4/28/2017] with format [MM/dd/yyyy]","caused\_by"

The Warning for the same index:  
This index has date fields with deprecated formats: [[type: qapass, field: date, format: MM/dd/yyyy, suggestion: 'y' year should be replaced with 'u'. Use 'y' for year-of-era.]]. Use new java.time date format specifiiers.

Can the upgrade assistant fix this in the next pre-8 version, or possibly give a logstash config to pull from the bad date index, fix the date, and push to a new index?

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<div class="post-metadata">

**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 29, 2019, 8:39pm UTC](https://discuss.elastic.co/t/date-parse-failed-on-kibana-index-update/188821/2 "2019-07-29T20:39:25Z")

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The 8.0 release of the Elastic Stack is still in very much in development. This sounds like a pre-release bug. You might file an issue on GitHub. [https://github.com/elastic/kibana/issues/new/choose](https://github.com/elastic/kibana/issues/new/choose)

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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 26, 2019, 8:39pm UTC](https://discuss.elastic.co/t/date-parse-failed-on-kibana-index-update/188821/3 "2019-08-26T20:39:27Z")

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