# Datetype format issue
**URL:** https://discuss.elastic.co/t/datetype-format-issue/164772
**Category:** Elasticsearch
**Created:** [January 18, 2019, 10:43am UTC](https://discuss.elastic.co/t/datetype-format-issue/164772 "2019-01-18T10:43:31Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@kunliu](https://discuss.elastic.co/u/kunliu)
#### Post date: [January 18, 2019, 10:43am UTC](https://discuss.elastic.co/t/datetype-format-issue/164772/1 "2019-01-18T10:43:31Z")
I have a date type field and I use default format. When index a field value like : 05/17/2018 01:37:48 PM ZE8, I got an error as below:
Invalid format: "05/17/2018 01:37:48 PM ZE8" is malformed at "/17/2018 01:37:48 PM ZE8"
I tried to use "yyyy-MM-dd HH:mm:ssZ||yyyy-MM-dd||epoch\_millis" as the format, but it returned error like
Invalid format: "2018-05-17T05:37:48Z" is malformed at "T05:37:48Z"
Is there any suggestion which format can fix this ? Thx
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### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [January 18, 2019, 11:15am UTC](https://discuss.elastic.co/t/datetype-format-issue/164772/2 "2019-01-18T11:15:25Z")
I think that the default format expects something like day/month/year....
Here 17 can not be a month.
Have a look at this page: [https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-date-format.html#custom-date-formats](https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-date-format.html#custom-date-formats)
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 15, 2019, 1:44pm UTC](https://discuss.elastic.co/t/datetype-format-issue/164772/4 "2019-02-15T13:44:37Z")
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