# Comparison (\<) not supported on datetime fields anymore since upgrade to 6.1
**URL:** https://discuss.elastic.co/t/comparison-not-supported-on-datetime-fields-anymore-since-upgrade-to-6-1/118008
**Category:** Elasticsearch
**Created:** [February 1, 2018, 11:34am UTC](https://discuss.elastic.co/t/comparison-not-supported-on-datetime-fields-anymore-since-upgrade-to-6-1/118008 "2018-02-01T11:34:58Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@stemps](https://discuss.elastic.co/u/stemps)
#### Post date: [February 1, 2018, 11:34am UTC](https://discuss.elastic.co/t/comparison-not-supported-on-datetime-fields-anymore-since-upgrade-to-6-1/118008/1 "2018-02-01T11:34:58Z")
I have a scripted field that looks something like this:
```auto
(doc['actual_time'].value < doc['expected_time'].value) ? 1 : 0
```
Since the upgrade to 6.1 I'm getting the following error:
```auto
caused_by":{"type":"class_cast_exception","reason":"Cannot apply [<] operation to types [org.joda.time.MutableDateTime] and [org.joda.time.MutableDateTime]."
```
The error message is rather confusing, as accoriding to [http://joda-time.sourceforge.net/apidocs/org/joda/time/MutableDateTime.html](http://joda-time.sourceforge.net/apidocs/org/joda/time/MutableDateTime.html) The `MutableDateTime` class implements `Comparable` and should therefore support `<` comparisons.
What's the correct way to compare timestamp fields in 6.1?
Thanks in advance,
Simon
---
### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [February 1, 2018, 5:40pm UTC](https://discuss.elastic.co/t/comparison-not-supported-on-datetime-fields-anymore-since-upgrade-to-6-1/118008/2 "2018-02-01T17:40:20Z")
Can you call then `getMillis()`?
[http://joda-time.sourceforge.net/apidocs/org/joda/time/base/BaseDateTime.html#getMillis()](http://joda-time.sourceforge.net/apidocs/org/joda/time/base/BaseDateTime.html#getMillis())
---
### Author:  [@stemps](https://discuss.elastic.co/u/stemps)
#### Post date: [February 5, 2018, 9:47am UTC](https://discuss.elastic.co/t/comparison-not-supported-on-datetime-fields-anymore-since-upgrade-to-6-1/118008/3 "2018-02-05T09:47:18Z")
Yep, that does it as a workaround. Thanks! 😀
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [March 5, 2018, 9:47am UTC](https://discuss.elastic.co/t/comparison-not-supported-on-datetime-fields-anymore-since-upgrade-to-6-1/118008/4 "2018-03-05T09:47:56Z")
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