Date format parse error

[F_eq_kx]

I'm getting Caused by: java.lang.IllegalArgumentException: failed to parse date field [Thu Jan 30 15:31:42 +00:00 2020] with format [strict_date_optional_time||epoch_millis||E M dd HH:mm:ss Z yyyy] when ingesting some data into Elasticsearch, but I can't figure out why.

I see the problematic date is Thu Jan 30 15:31:42 +00:00 2020 so I added E M dd HH:mm:ss Z yyyy as a custom date pattern. Shouldn't this pattern match the date? I haven't been able to find any good ways to test ES date pattern matching.

[spinscale (Alexander Reelsen)]

Hey,

try

EEE MMM dd HH:mm:ss XXX yyyy

I recently wrote a small tool to easier play with parsing date formats. It's available at https://esddd.herokuapp.com/

I tried the above datepattern in combination with Thu Jan 30 15:31:42 +00:00 2020 as the data to check, and the parsing worked.

As you can see java dates are a bit tricky with regards to the length of those letters (E vs. EEE) as those have different meanings how to interpret the input.

hope this helps!

[F_eq_kx]

Awesome, thanks! You guys should add your link to the date formatting docs! Very useful.