Check If A String Is A Valid Date Using DateTime.TryParse

Answer :

If you want your dates to conform a particular format or formats then use DateTime.TryParseExact otherwise that is the default behaviour of DateTime.TryParse

DateTime.TryParse

This method tries to ignore unrecognized data, if possible, and fills in missing month, day, and year information with the current date. If s contains only a date and no time, this method assumes the time is 12:00 midnight. If s includes a date component with a two-digit year, it is converted to a year in the current culture's current calendar based on the value of the Calendar.TwoDigitYearMax property. Any leading, inner, or trailing white space character in s is ignored.

If you want to confirm against multiple formats then look at DateTime.TryParseExact Method (String, String[], IFormatProvider, DateTimeStyles, DateTime) overload. Example from the same link:

string[] formats= {"M/d/yyyy h:mm:ss tt", "M/d/yyyy h:mm tt",                     "MM/dd/yyyy hh:mm:ss", "M/d/yyyy h:mm:ss",                     "M/d/yyyy hh:mm tt", "M/d/yyyy hh tt",                     "M/d/yyyy h:mm", "M/d/yyyy h:mm",                     "MM/dd/yyyy hh:mm", "M/dd/yyyy hh:mm"}; string[] dateStrings = {"5/1/2009 6:32 PM", "05/01/2009 6:32:05 PM",                          "5/1/2009 6:32:00", "05/01/2009 06:32",                          "05/01/2009 06:32:00 PM", "05/01/2009 06:32:00"};  DateTime dateValue;  foreach (string dateString in dateStrings) {    if (DateTime.TryParseExact(dateString, formats,                                new CultureInfo("en-US"),                                DateTimeStyles.None,                                out dateValue))       Console.WriteLine("Converted '{0}' to {1}.", dateString, dateValue);    else       Console.WriteLine("Unable to convert '{0}' to a date.", dateString); } // The example displays the following output:  //       Converted '5/1/2009 6:32 PM' to 5/1/2009 6:32:00 PM.  //       Converted '05/01/2009 6:32:05 PM' to 5/1/2009 6:32:05 PM.  //       Converted '5/1/2009 6:32:00' to 5/1/2009 6:32:00 AM.  //       Converted '05/01/2009 06:32' to 5/1/2009 6:32:00 AM.  //       Converted '05/01/2009 06:32:00 PM' to 5/1/2009 6:32:00 PM.  //       Converted '05/01/2009 06:32:00' to 5/1/2009 6:32:00 AM. 

Use DateTime.TryParseExact() if you want to match against a specific date format

 string format = "ddd dd MMM h:mm tt yyyy"; DateTime dateTime; if (DateTime.TryParseExact(dateString, format, CultureInfo.InvariantCulture,     DateTimeStyles.None, out dateTime)) {     Console.WriteLine(dateTime); } else {     Console.WriteLine("Not a date"); } 

[TestCase("11/08/1995", Result= true)] [TestCase("1-1", Result = false)] [TestCase("1/1", Result = false)] public bool IsValidDateTimeTest(string dateTime) {     string[] formats = { "MM/dd/yyyy" };     DateTime parsedDateTime;     return DateTime.TryParseExact(dateTime, formats, new CultureInfo("en-US"),                                    DateTimeStyles.None, out parsedDateTime); } 

Simply specify the date time formats that you wish to accept in the array named formats.