Convert any string Date to yyyy-dd-MM format using C# and VB.Net in ASP.Net

Hi telldurges,

Refer below code.

C#

string date = "06.20.2020";
string[] validformats = new[] { "MM-dd-yyyy", "MM/dd/yyyy","MM.dd.yyyy",
                                "dd-MM-yyyy","dd/MM/yyyy", "dd.MM.yyyy" ,
                                "yyyy-MM-dd","yyyy/MM/dd", "yyyy.MM.dd" ,
                                "yyyy-dd-MM","yyyy/dd/MM", "yyyy.dd.MM" };

System.Globalization.CultureInfo provider = new System.Globalization.CultureInfo("en-US");

try
{
    DateTime dateTime = DateTime.ParseExact(date, validformats, provider, System.Globalization.DateTimeStyles.None);
    Response.Write("The specified date is valid: " + dateTime);
}
catch (FormatException ex)
{
    Response.Write("Unable to parse the specified date");
}

VB.Net

Dim date As String = "06.20.2020"
Dim validformats As String() = {"MM-dd-yyyy", "MM/dd/yyyy", "MM.dd.yyyy", "dd-MM-yyyy", "dd/MM/yyyy", "dd.MM.yyyy", "yyyy-MM-dd", "yyyy/MM/dd", "yyyy.MM.dd", "yyyy-dd-MM", "yyyy/dd/MM", "yyyy.dd.MM"}
Dim provider As System.Globalization.CultureInfo = New System.Globalization.CultureInfo("en-US")

Try
    Dim dateTime As DateTime = DateTime.ParseExact(date, validformats, provider, System.Globalization.DateTimeStyles.None)
    Response.Write("The specified date is valid: " & dateTime)
Catch ex As FormatException
    Response.Write("Unable to parse the specified date")
End Try