After using the Grok Debugger often in the last weeks, I searched for a similar service for joda's time patterns to parse strings. I did not find anything, so I created one, for you and for me.

Update on 2017-09-26: Just updated this application to use Java 8's DateTime API, removing JodaTime, using only Java 8's DateTime API.

The former URL ist not reachable any more.

You can find the source code on github.