RH KA, please check your private messages for an administrative matter. You can see them by clicking
My Private Messages.
No, there is no way you can repair that, because information on the correct date has been lost because of the error.
For example, if the date in the database is 2009-01-03, how do you know if the user entered 1 March 2009 or 13 March 2009 or something else? There's no way to distinguish between the different possibilities, so it is impossible to repair this.
I'm afraid there is nothing you can do other than ask the customer to reenter the dates.