In the PT date list, 5/30/13 appeared after 7/31/13 in the column. Checked the source data and found that it was correctly formatted as 'dates'. The only thing I could do to get the May date to appear before the July date was to first change the source data formatting to 'General', which converted the dates to 5-digit numbers. When I refreshed the PT, 5/30/13 appeared before 7/31/13. Changing the source data back to date format and refreshing again put 5/30/13 after 7/31/13. This only happens to one date in the list, 5/30/13, i.e., the other dates are in the proper order each time I refresh. Any idea what's happening here? Thanks! Needless to say, it's a pain to have to do this workaround to get the PT to properly order the dates.