Check if a string contains date or not

Given a string "15:30:20" and "2011-09-02 15:30:20", How can I dynamically check if a given string contains date or n开发者_StackOverflow中文版ot?

"15:30:20" -> Not Valid

"2011-09-02 15:30:20" => Valid

Use DateTime.TryParseExact Method.

string []format = new string []{"yyyy-MM-dd HH:mm:ss"};
string value = "2011-09-02 15:30:20";
DateTime datetime;

if (DateTime.TryParseExact(value, format, System.Globalization.CultureInfo.InvariantCulture,System.Globalization.DateTimeStyles.NoCurrentDateDefault  , out datetime))
   Console.WriteLine("Valid  : " + datetime);
else
  Console.WriteLine("Invalid");

You can use

bool b = DateTime.TryParseExact("15:30:20", "yyyy-MM-dd HH:mm:ss",CultureInfo.InvariantCulture,DateTimeStyles.AssumeLocal,out datetime);

To check if a string is parsable into DateTime.

Use this method to check if string is date or not:

    private bool CheckDate(String date)
    {
        try
        {
            DateTime dt = DateTime.Parse(date);
            return true;
        }
        catch
        {
            return false;
        }
    }

For dotnet core 2.0,

DateTime.TryParseExact("2017-09-02", "dd MMM yyyy", CultureInfo.InvariantCulture, DateTimeStyles.NoCurrentDateDefault, out DateTime dtDateTime)