# How to replace @timestamp field in logstash aggregate filter map
**URL:** https://discuss.elastic.co/t/how-to-replace-timestamp-field-in-logstash-aggregate-filter-map/275708
**Category:** Logstash
**Created:** [June 11, 2021, 6:08pm UTC](https://discuss.elastic.co/t/how-to-replace-timestamp-field-in-logstash-aggregate-filter-map/275708 "2021-06-11T18:08:24Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@jratliff](https://discuss.elastic.co/u/jratliff)
#### Post date: [June 11, 2021, 6:08pm UTC](https://discuss.elastic.co/t/how-to-replace-timestamp-field-in-logstash-aggregate-filter-map/275708/1 "2021-06-11T18:08:24Z")
I'm using the logstash aggregate filter. When the map is pushed upon timeout, I want to set the @timestamp field to be a specific valu.
I've tried using timeout\_code =\> event.set('@timestamp', "2021-06-10T19:00:00.000Z").
I've tried this with Time.utc(2021, 6, 10, 19, 0, 0), and Time.utc(2021, 6, 10, 19, 0, 0).to\_i
I've tried using the date filter both before and after the aggregate filter.
I either get nothing, or it spews out errors saying it doesn't like me trying to change the @timestamp field.
What can I do to update the @timestamp?
Thanks.
--John
---
### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [June 11, 2021, 7:13pm UTC](https://discuss.elastic.co/t/how-to-replace-timestamp-field-in-logstash-aggregate-filter-map/275708/2 "2021-06-11T19:13:49Z")
@timestamp has to be a LogStash::Timestamp. You could try
```
event.set("@timestamp", LogStash::Timestamp.new(Time.utc(2021, 6, 10, 19, 0, 0))
```
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 9, 2021, 7:14pm UTC](https://discuss.elastic.co/t/how-to-replace-timestamp-field-in-logstash-aggregate-filter-map/275708/3 "2021-07-09T19:14:21Z")
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