# Convert String to date and replace @timestamp

**URL:** <https://discuss.elastic.co/t/convert-string-to-date-and-replace-timestamp/211455>\
**Category:** Logstash\
**Created:** [December 11, 2019, 11:07am UTC](https://discuss.elastic.co/t/convert-string-to-date-and-replace-timestamp/211455 "2019-12-11T11:07:49Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![ginu](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ginu/32/86297_2.png) [@ginu](https://discuss.elastic.co/u/ginu)\
**Post date:** [December 11, 2019, 11:07am UTC](https://discuss.elastic.co/t/convert-string-to-date-and-replace-timestamp/211455/1 "2019-12-11T11:07:49Z")

</div>

Hi all  
I have a custom field  
msg.message.timestamp which have the date in the format **yyyy-MM-ddThh:mm:ss.nnnZ** format  
eg. 2019-12-11T10:17:54.961Z

I would like to use this as @timestamp. I tied a couple of things without success:  
Try 1:

```
if ([msg][message][timestamp]){
        ruby {
            id => update_timetaken_with_msg_message_timestamp
            code => "b=event.get('[msg][message][timestamp]'); event.set('@timestamp', DateTime.parse(b);"
        }
}

```

Try 2:

```
mutate {
    convert => { "[msg][message][timestamp]" => "string" }
}
date {
    match => ["[msg][message][timestamp]", "yyyy-MM-dd'T'HH:mm:ss'.'SSS'Z'"]
    timezone => "UCT"
    target => "@timestamp"
}

```

But unfortunately, both are not working ☹

Regards, Ginu

---

<div class="post-metadata">

**Author:** ![Jenni](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jenni/32/29684_2.png) [@Jenni](https://discuss.elastic.co/u/Jenni)\
**Post date:** [December 11, 2019, 1:16pm UTC](https://discuss.elastic.co/t/convert-string-to-date-and-replace-timestamp/211455/2 "2019-12-11T13:16:02Z")

</div>

Does this work?

```
date {
    match => ["[msg][message][timestamp]", "ISO8601"]
}
```

---

<div class="post-metadata">

**Author:** ![ginu](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ginu/32/86297_2.png) [@ginu](https://discuss.elastic.co/u/ginu)\
**Post date:** [December 11, 2019, 1:27pm UTC](https://discuss.elastic.co/t/convert-string-to-date-and-replace-timestamp/211455/3 "2019-12-11T13:27:15Z")

</div>

Thanks a lot Jenni... that worked.

`date {`  
` match => ["[msg][message][timestamp]", "ISO8601"]`  
` target => "@timestamp"`  
` }`

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 8, 2020, 1:27pm UTC](https://discuss.elastic.co/t/convert-string-to-date-and-replace-timestamp/211455/4 "2020-01-08T13:27:19Z")

</div>

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