John has given links to exactly the right information needed to solve this problem.
I had the exact same error.
It started after upgrading from JIRA v3.3.x to JIRA v4.4.x. I had not changed configuration in either the "Date/Time Formats" section of "Look and Feel" or the date.picker formats in "Advanced Settings" - but suddenly date format errors were displayed when Releasing a Version in JIRA.
For me, all the configurations matched up in terms of order.... ie, from "Advanced Settings":
jira.date.picker.javascript.format %e/%b/%y
jira.date.picker.java.format d/MMM/yy
And from "Look and Feel":
Complete Date/Time Format dd-MMM-yy h:mm a
Day/Month/Year Format dd-MMM-yy
But note that the separator is different. A hyphen in look and feel and a forward slash in Advanced.
I solved my error by changing the date.picker separators to a hyphen to match the Look & Feel settings (on the logic that users were now familiar with the hyphens). But I could just as easily have gone the other way. The important thing is that things must be consistent.
From your error (2012-10-04 entered but JIRA wants 4/oct/2012) you'll have to make a decision about what separator to use *and* get the format consistent as well.
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