# Compare Logstash Old Event Against New One and Make Math Operation
**URL:** https://discuss.elastic.co/t/compare-logstash-old-event-against-new-one-and-make-math-operation/256457
**Category:** Logstash
**Created:** [November 24, 2020, 7:48am UTC](https://discuss.elastic.co/t/compare-logstash-old-event-against-new-one-and-make-math-operation/256457 "2020-11-24T07:48:26Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@rknd](https://discuss.elastic.co/u/rknd)
#### Post date: [November 24, 2020, 7:48am UTC](https://discuss.elastic.co/t/compare-logstash-old-event-against-new-one-and-make-math-operation/256457/1 "2020-11-24T07:48:26Z")
Hello everyone,
I want to compare the time object in each row with the next date object and get the difference between them and print them on the screen. I tried Aggregate plugin, Elapsed plugin, but could not reach the solution I wanted. Can you give an example filter that I can provide with Ruby script?
Log :
00:04:00 Enter user2
14:12:44 Enter user1
15:13:44 Enter user2
16:18:44 Enter user1
17:58:44 Enter user2
19:58:44 Restart
00:01:27 Enter user1
13:22:44 Exit user1
Question :
Assume that
variable1 = 14:12:44
variable2 = 15:13:44
variable3 = 00:01:27
if (variable2 \> variable1 )
print 15:13:44 - 14:12:44
else if (variable2 \> variable3)
print dateVariable++
Could you give me a filter example that solves this ?
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 22, 2020, 7:48am UTC](https://discuss.elastic.co/t/compare-logstash-old-event-against-new-one-and-make-math-operation/256457/2 "2020-12-22T07:48:31Z")
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