What is the timestamp retuned in the @timestamp filed of csv report generated from Kibana

The timestamp in the @timestamp field in the csv report is looking very different than the actual timestamp. Please find below a screenshot of the same. On the right hand side is the timestamp in the csv report and at the left side is the actual timestamp. Why is the timestamp changed so in the csv report? What type of date format is that?

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@ggeorge This looks like a bug with CSV reporting. Can you file a bug report in the Kibana repo?

@Catherine_Liu Thanks a lot. I have raised a bug report for the same.