Help with Dates

Question

I have a preferencess tab in the screen which has different formats dd/mm/yy mm/dd/yyy formats so user slects then now the date comming in is in this format either 1) or 2) i want to reformat this to the database format "s" ParseExact uses a Culture Info but a user in En-US may have "DD-MMM-YYYY" as his preference so how do i solve this problem to convert given The Invarient Culture reads regional settings which is not the right thing to do. Known items 1) Data 2) InputFomrat Required 3) OutputFormat - "s" any mails or andy help would be apriciated. [email protected]