# How to calculate timestamp difference in logstash config file?
**URL:** https://discuss.elastic.co/t/how-to-calculate-timestamp-difference-in-logstash-config-file/244732
**Category:** Logstash
**Created:** [August 12, 2020, 1:58pm UTC](https://discuss.elastic.co/t/how-to-calculate-timestamp-difference-in-logstash-config-file/244732 "2020-08-12T13:58:38Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Rahul\_Chougule](https://discuss.elastic.co/u/Rahul_Chougule)
#### Post date: [August 12, 2020, 1:58pm UTC](https://discuss.elastic.co/t/how-to-calculate-timestamp-difference-in-logstash-config-file/244732/1 "2020-08-12T13:58:38Z")
I have two timestamp fields: submit\_date("MM/dd/YYYY HH:mm") and completed date("MM/dd/YYYY HH:mm").
I want to calculate time difference between these two fields and wanted to add it as a new field while ingesting data in Elasticsearch.
any help will be appreciated.
Thank you.
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### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [August 12, 2020, 2:25pm UTC](https://discuss.elastic.co/t/how-to-calculate-timestamp-difference-in-logstash-config-file/244732/2 "2020-08-12T14:25:10Z")
Parse them both using date filters, then use ruby to calculate the difference. Something like [this](https://discuss.elastic.co/t/trying-to-calculate-differences-between-2-timestamps/242443/2).
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [September 9, 2020, 2:25pm UTC](https://discuss.elastic.co/t/how-to-calculate-timestamp-difference-in-logstash-config-file/244732/3 "2020-09-09T14:25:17Z")
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