I have a new install (one month) of Jira core. I have 5 users, 30 issues, one project and a simple workflow. I use English and Swedish.
When I search for issues with overdue due dates it returns issues not overdue (due <= "0").

(image from the dashboard with a simple overdue filter. The date was 18th march.)
Also, which seems to be related, when I sort by due date, it sorts it incorrectly.

Or are there other parameters/factors I have missed?
It should just be a simple date sort, right?
Could there be some wrong with due date storage? I have no clue where to begin debugging.
As you see, the view date is changed from default - but I have also tried default date format.
This post comes from my original post here.