I am writing a method which accepts year as parameter. I.e. four digit number equal or less than current year. Calendar is Gregorian only (for now.. not sure about the future) and I most certainly won't need anything BC.

Which data type am I to use? Obvious solutions would be using DateTime or Int32 :

public void MyFunction(DateTime date)
{
     // year to work with: date.Year;
     // date.Month, date.Day, etc. is irrelevant and will always be
}

or

public void MyFunction(Int year)
{
     if ( year > 9999 || otherValidations == false )
     {
         //throw new Exception...
     }

     // year to work with: new DateTime(year, 1, 1);
}

Any other alternatives apart from writing my own custom data type Year?

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