The following note is in localOverrides.conf:
################################################################################
# Student Date Format
################################################################################
# Uncomment the following line to customize the format of the dates displayed to
# students. As it is written, the line below will display open, due and answer
# dates in the following format: Wed Jun 27 at 10:30am
# For all available options, consult the documentation for perl DateTime under
# "strftime patterns".
# $studentDateDisplayFormat="%a %b %d at %l:%M%P";
(Danny, I think you were the one who brought the date formatting issue up at one of our workshops -- ages ago. )
I haven't used it or tested it so YMMV. Report back and let us know if it does what you want. The variable is referenced in ProblemSet.pm and ProblemSets.pm
You should be able to set
# $studentDateDisplayFormat="%a %b %d at %l:%M%P";
in course.conf if you want to change the format for a single course.