how to change string in Date format change in asp.net

It isn't "changing in" "07/02/2011" because you just did cast a string to date, but that would be the default representation of a date. The representation is "MM/dd/yyyy" and cannot logically be changed due to possible errors in interpretation because it is unclear if 07 is the month or the day (this also goes for 02 in the date given).

I myself am from the netherlands and the representation there is using a dash(-) instead of a slash(/) and the date is starting with the day instead of the month. So "07/02/2011" would become "02-07-2011". The slash and dash keep it clear what the first two values represent (either day or month). Without that there is really no way to know except when the day is above 13 because there is no 13th month.

So, could you please explain what the reason is to reverse day and month? If you really want to, you can just use the Split method like:

string [] split = date.Split(new Char [] {'\\'});
// You should need to check the lower and upper bound of the array 
string newDate = split[1] + split[0] + split[2];

You could also use a custom formatting:

string newDate = String.Format("{0:dd/MM/yyyy}", dt); // dt is of type DateTime

Good luck!

You can get help from this link:

http://www.csharp-examples.net/string-format-datetime/[^]

try this simple soln:-

string DateString  = "07/02/2011";
DateTime date = new DateTime();
date = DateTime.ParseExact(DateString, "dd/MM/yyyy");
string NewDateString = date.ToString("MM/dd/yyyy");

or

var result = DateTime.ParseExact("07/02/2011", "MM/dd/yyyy", System.Globalization.CultureInfo.CurrentCulture);

string test = "07/02/2010";
        DateTime dt123 = DateTime.ParseExact(test, "dd/MM/yyyy",null);
        Response.Write(dt123.ToString());

This has been answered around a week back here[^] and for you.