Exact HOUR from date type field

Elastic Stack Logstash
1

I have a date field like this - "orig_dt" => "2008-09-20 17:51:00",
How do I extract HOUR (=17) from it?

Thanks!

2

The grok filter would be a good choice.

3

yeah, I tried grok filter before posting and I was hoping that someone would show how to configure a grok filter to parse HOUR.

Thanks!