Summary

Bulk editing the due date in German language will return error. And the error message is empty:

Steps to Replicate

1. Use German language
2. Bulk edit Due Date to March 1st

Expected Result

The Due date get edited to March 1st

Current Result

JIRA returns empty error message as shown in the image above.

Workaround

Use a different language or change the Date/Time format to display months in number. For example, 1st March 2018 is shown as 01/3/2018