Forms date does not parse correctly - fail validation when linked to a Jira date field and using any date format but the default

Issue Summary

Form will not submit if a date field is linked to a forms field when Jira Advanced settings are using any date format but the default

Steps to Reproduce

1. Have a date field linked to a Jira date field
2. Use the date format dd.MM.yyyy or any other option that is different than the default under Jira Advanced settings for jira.date.picker.java.format

https://confluence.atlassian.com/jira/changing-the-due-date-input-format-192536.html

Expected Results

For the form to submit and the field to be updated

Actual Results

Console logs an POST with error 400

{"errors":[{"errorMessage":"Please provide a valid value for field 'Due date","field":"duedate"}],"reasonKey":"validation.error","reasonCode":"400"}

Workaround

Change the Advanced setting to d/MMM/yy