Some tweaks, that may (or not) help
The first controls how dates APPEAR in the columns
The Second makes behave as seen (a normal sort still considers the stuff you can't see)
Code:
ID: gui_pubdate_display_format
-----
# Control how dates are displayed
gui_pubdate_display_format = u'MMM yyyy'
gui_timestamp_display_format = u'dd MMM yy, hh:mm'
gui_last_modified_display_format = u'dd MMM yy hh'
Code:
# Choose whether dates are sorted using visible fields
sort_dates_using_visible_fields = False
Labels? You can use the Python formatting rules i some of the Advanced templates