Summary

Bulk editing the due date in using a different language than English will return an error. And the error message is empty:

Steps to Replicate

1. Use another language than English (French or Spanish, for example)
2. Bulk edit Due Date to June 14th

Expected Result

The Due date get edited to June 14th

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, 14th June 2018 is shown as 14/6/2018

• Advanced Setting:
  jira.date.picker.java.format: dd/MM/yy
  jira.date.picker.javascript.format: %d/%m/%y
  jira.date.time.picker.java.format: dd/MM/yy h:mm a
  jira.date.time.picker.javascript.format: %d/%m/%y %I:%M %p
  

• Jira Look and Feel settings:
  Time Format:  h:mm a
  Day Format:  EEEE h:mm a
  Complete Date/Time Format: dd/MM/yy h:mm a
  Day/Month/Year Format: dd/MM/yy