Date/DateTime Picker log format different in UI and Date exported to excel shows different date

Summary

I did change the format for both Date and Date Time picker but the look and feel is not showing the correct format. Lets say I used the format for DateTime and Date picker as

• jira.date.picker.java.format=yyyy-MM-dd
• jira.date.picker.javascript.format=%Y-%m-%d
• jira.date.time.picker.java.format=yyyy-MM-dd HH:mm
• jira.date.time.picker.javascript.format=%Y-%m-%d %H:%M

Set the date as
Date=02/09/1900
DateTIme=1900-02-02 18:02

• When viewing it via browsing it image A ( Format is showing differently in UI )
• When you try to edit it image B & C ( These looks fine )
• When you export it via excel image D ( DatePicker format/data is wrong ).
  Verified in backend and dates are correct.

Steps to Reproduce

1. Login to JIRA as SYS Admin
2. [Change Date and Date time format||https://confluence.atlassian.com/jira/changing-the-due-date-input-format-192536.html] using above format.

Expected Results

Format in UI and extracting data for DatePicker should be same data and format.

Actual Results

Check Image A and Image D column DatePicker field.

Workaround

No workaround