Check if string contains valid year

Check if string contains valid year

• Sobachatina

  also as long as it does not exceed the DateTime.MaxValue year date - 9999 I think
  
  

• Amde

  Hi

  Or you can do like this :

  try

  {

  new DateTime(int.Parse(MyString), 1, 1);

  }

  catch (Exception)

  {

  // Invalid year value

  }

  Yours

  Markku

  
  

• jackline

  My Version:

  string MyString="1776"; Console.WriteLine(DateTime.ParseExact(MyString,"yyyy", CultureInfo.CurrentCulture));

  
  
  

• jrx

  Any integer is potentially a valid year.

  
  Except for 0. There is no year 0.
  
  

• Emadkb

  Hi Raihan,

  Your code throws an exception because 2001 isn't a valid date. It may be a valid year (you and I both know it is), but just isn't a valid date.

  You could intialize a new datetime object and then use the AddYears method to add the number of years. The resulting date will be January 1st of year+1 (a new datetime intializes to 1/1/0001)

  string MyString = "2001";

  DateTime MyDate = new DateTime();

  DateTime MyDate2 = MyDate.AddYears(int.Parse(MyString));

  Console.WriteLine(MyDate2.ToString());

  Please not that in the example above, int.Parse(MyString) will throw an exception if MyString doesn't contain a valid integer value. If you are using VS 2005 (.NET framework 2.0), you should use the int.TryParse() method. Otherwise you'll have to place the parsing of the integer in a try catch block.

  Hope this helps,

  
  
  

• blackmamba

  What do you mean by "a valid year" Any integer is potentially a valid year.

  If you mean a four-digit integer starting with 19 or 20 then you could use a regular expression:

  if(Regex.IsMatch(MyString, "^(19|20)[0-9][0-9]"))
  ...

  That can easily be adapted to stretch the rules of what constitutes a valid year.

  If the year has to be between a minimum and a maximum, convert it to an integer and check it:

  int year;
  if(int.TryParse(MyString, out year) && (year >= 1942 && year <= 2142))
  ...

  HTH

  
  
  

• Luc Pettett

  The valid year is in a range 1 to 9999 inclusively
  
  
• Check if string contains valid year