配置K2工作清单以按数字日期时间显示和排序任务？

My company is developing a workflow using K2 Blackpearl which employees will interact with using K2 worklists. I would like to sort their worklist tasks chronologically, with the oldest instances at the top. Sorting on the column 'Workflow Start Date' should solve the issue, except this column displays hh/mm for items <24 hours, days of the week (which sort alphabetically?!) and dd/mm/yy for items >7 days old. Obviously sorting three different data types produces a meaningless result.My company is developing a workflow using K2 Bl