Steps to reproduce:
1. Browse to Admin UI -> Inspect Workflow
2. Click on Workflow Instance tab
3. Look at the schedule.location field under Configuration
schedule.location has what appears to be uninitialized data being formatted as a date
Not sure what to expect here - but in MH-8700, which deals with the date formatting on this same page, all the screen shots have the number 599 in schedule.location.
Workaround (if any):
See - there was obviously work going on in this area, perhaps the date formatting fix applied in 8700 was incorrectly applied to this field.