Web Forms :: Date Time Formatting To A Specific Dateformat?

I have been struggling with this for a long time. I have a form in which there is a textbox using an ajax calender extender. Now, the problem is that, I want to take the Date value which is string format and format it to a specific date format before inserting it into the database. The following is the core problem:Dim MDate as string=txtMeetingDate.Textdim d as new Datetime ' I want to convert the d to a datetime using the Mdate/// The problem is that I don't know what's the date format in the TextBox because users can use any time format they want, it is based on their windows settings!!!

So, I am struggling to change my String (MDate) into a DateTime in the same format the user have and then convert it into my format:"dd/MM/yyyy" and after I have the date in the correct format, I want to change it back to string and save it in the database.I am doing this so that I have the same dateformat saved in my database.