# Getting exception while storing the date field format as strict\_hour\_minute
**URL:** https://discuss.elastic.co/t/getting-exception-while-storing-the-date-field-format-as-strict-hour-minute/270540
**Category:** Elasticsearch
**Created:** [April 19, 2021, 6:26am UTC](https://discuss.elastic.co/t/getting-exception-while-storing-the-date-field-format-as-strict-hour-minute/270540 "2021-04-19T06:26:29Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@anjilinga](https://discuss.elastic.co/u/anjilinga)
#### Post date: [April 19, 2021, 6:26am UTC](https://discuss.elastic.co/t/getting-exception-while-storing-the-date-field-format-as-strict-hour-minute/270540/1 "2021-04-19T06:26:29Z")
Hi,
Created a field with mapping strict\_hour\_minute.
running transform with group by field as below.
"PeriodStartDateTime": {
"date\_histogram": {
"field": "StartDateTime",
"fixed\_interval": "15m"
}
},after running the transform while saving the period start date time in HH:mm format it is giving error as below in transform.
DateTimeParseException[Text '1618470900000' could not be parsed at index 2];; MapperParsingException[failed to parse field [newtimetestnew] of type [date] in document with id 'TAAwRQAyIhk-5v8CBxjfCPpPYYzQEgAA'. Preview of field's value: '1618470900000']; nested: IllegalArgumentException[failed to parse date field [1618470900000] with format [strict\_hour\_minute]]; nested: DateTimeParseException[Text '1618470900000' could not be parsed at index 2];; java.lang.IllegalArgumentException: failed to parse date field [1618470900000] with format [strict\_hour\_minute]]
can you please suggest how to save date field as HH:mm
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [May 17, 2021, 6:26am UTC](https://discuss.elastic.co/t/getting-exception-while-storing-the-date-field-format-as-strict-hour-minute/270540/2 "2021-05-17T06:26:30Z")
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