# Add\_field =\> \[ "EventDate", "%{@timestamp}" \]
**URL:** https://discuss.elastic.co/t/add-field-eventdate-timestamp/33543
**Category:** Logstash
**Created:** [November 2, 2015, 4:31pm UTC](https://discuss.elastic.co/t/add-field-eventdate-timestamp/33543 "2015-11-02T16:31:02Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Erik\_Parienty](https://discuss.elastic.co/u/Erik_Parienty)
#### Post date: [November 2, 2015, 4:31pm UTC](https://discuss.elastic.co/t/add-field-eventdate-timestamp/33543/1 "2015-11-02T16:31:02Z")
when i using **add\_field =\> ["EventDate", "%{@timestamp}"]**
i see this
{
"@version" =\> "1",
"@timestamp" =\> "2015-11-02T16:23:57.815Z",
"type" =\> "blabla",
**"EventDate" =\> "%{@timestamp}",**
"Cluster" =\> "blabla",
"host" =\> "blabla",
"command" =\> "sudo /myscript"
}
its only happens when using add\_field =\> ["EventDate", "%{@timestamp}"] in input exec on centos
---
### Author:  [@theuntergeek](https://discuss.elastic.co/u/theuntergeek)
#### Post date: [November 2, 2015, 6:12pm UTC](https://discuss.elastic.co/t/add-field-eventdate-timestamp/33543/2 "2015-11-02T18:12:20Z")
> [@Erik\_Parienty](#):
>
> its only happens when using add\_field =\> ["EventDate", "%{@timestamp}"] in input exec
This is because there is no field `@timestamp` until _after_ the new event exits the input block. In other words, `@timestamp` is not a part of the event in the input block, so trying to add this field here will never work.
If you were to add a conditional and mutate filter, you can get the desired outcome:
```
filter {
if [type] == "blablah" {
mutate {
add_field => { "EventDate" => "%{@timestamp}" }
}
}
}
```
Or something like it.
---
### Author:  [@Erik\_Parienty](https://discuss.elastic.co/u/Erik_Parienty)
#### Post date: [November 3, 2015, 8:14am UTC](https://discuss.elastic.co/t/add-field-eventdate-timestamp/33543/3 "2015-11-03T08:14:44Z")
Thanks a lot 🙂
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 5:24am UTC](https://discuss.elastic.co/t/add-field-eventdate-timestamp/33543/4 "2017-07-06T05:24:22Z")