# Date filter failure

**URL:** <https://discuss.elastic.co/t/date-filter-failure/143706>\
**Category:** Logstash\
**Created:** [August 9, 2018, 1:21pm UTC](https://discuss.elastic.co/t/date-filter-failure/143706 "2018-08-09T13:21:25Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![JPelastic](https://avatars.discourse-cdn.com/v4/letter/j/9e8a1a/32.png) [@JPelastic](https://discuss.elastic.co/u/JPelastic)\
**Post date:** [August 9, 2018, 1:21pm UTC](https://discuss.elastic.co/t/date-filter-failure/143706/1 "2018-08-09T13:21:25Z")

</div>

I am trying to parse "datum" into "@timestamp". This is the output

```json
{
          "tags" => [
        [0] "_dateparsefailure"
    ],
      "@version" => "1",
         "datum" => 2018-03-01T01:24:31.037Z,
    "@timestamp" => 2018-08-09T13:13:01.536Z
}

```

this is my filter

```json
filter {
	date {
		match => ["datum", "ISO8601"] 
	}
}

```

There is no errormessage.

If i understand the documentation, the ISO8601 should recognize my datum-value (which is a string, which I tested when I tried to mutate/replace timestamp with datum).

Any ideas how I could get this to work?

---

<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [August 9, 2018, 1:27pm UTC](https://discuss.elastic.co/t/date-filter-failure/143706/2 "2018-08-09T13:27:13Z")

</div>

See [https://github.com/logstash-plugins/logstash-filter-date/issues/95](https://github.com/logstash-plugins/logstash-filter-date/issues/95) and the workaround mentioned there.

---

<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:** [September 6, 2018, 1:27pm UTC](https://discuss.elastic.co/t/date-filter-failure/143706/3 "2018-09-06T13:27:14Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.