Due Dates are ambiguous. It should capture the time based on the user's profile timezone settings.

Currently, it stores without time value.

Compare vs. the Created Date on a server running on UTC time:

+---------------------+---------------------+
| created             | duedate             |
+---------------------+---------------------+
| 2013-05-03 21:21:35 | 2013-05-03 00:00:00 | 
+---------------------+---------------------+

This can lead to inconsistent rendering of the duedate, especially if the server is on UTC time, and users are scattered around the world.

Example:

On the issue view, it'll show me one date, but when using the jiraissues macro, it shows a date behind.