Returns the text that comes after a digit in a date (e.g. 1 = 1st, 15 = 15th, 23 = 23rd, etc)

GetDaySuffix.cs

		public static string GetDaySuffix(int day)
		{
			switch (day)
			{
				case 1:
				case 21:
				case 31:
					return "st";
				case 2:
				case 22:
					return "nd";
				case 3:
				case 23:
					return "rd";
				default:
					return "th";
			}
		}