try
{
string dateformat = "dd/MM/yyyy";
string[] ass = s.Split('/');
if (ass[0].Length == 1)
{
ass[0] = "0" + ass[0];
}
if (ass[1].Length == 1)
{
ass[1] = "0" + ass[1];
}
s = ass[0] + "/" + ass[1] + "/" + ass[2];
DateTime dt = DateTime.ParseExact(s, dateformat, null);
string day = dt.Day.ToString();
string month = dt.Month.ToString();
string year = dt.Year.ToString();
s = year + "/" + month + "/" + day;
s = s.Replace("/", "-");
}
catch (Exception err)
{
}
return s;
try it