C＃中的日期和时间格式

Question

          int MM;
          int DD;
          int YYYY;
          switch(MM)
          {
                case 1:
                   DD = 31;
                   break;
                case 2:
                   DD = 28;
                   LDD = 29;
                   break;
                case 3:
                   DD = 31;
                   break;
                case 4:
                   DD = 30;
                   break;
                case 5:
                   DD = 31;
                   break;
                case 6:
                   DD = 30;
                   break;
                case 7:
                   DD = 31;
                   break;
                case 8:
                   DD = 31;
                   break;
                case 9:
                   DD = 30;
                   break;
                case 10:
                   DD = 31;
                   break;
                case 11:
                   days = 30;
                   break;
                case 12:
                   DD = 31;
                   break;
                default:
                   {
                            Console.WriteLine("Invalid option");
                   }
        }
        if(Date == MM/DD/YYYY)
        string Date = Console.ReadLine();

I am trying to write a code that would accept the date as string and only in this format mm/dd/yyyy and the time has to accepted only in this format 10:00AM By using DateTime i am getting the time in this format 10:00:00, the hour,minute,second format which i don't want.

I dont want to use try catch, exception.

Answer 1

Use DateTime.ParseExact and write your format string following these guidlines:

http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx

Answer 2

您可以使用DateTime.ParseExact方法，并在其第二个参数中写入格式定义。

Answer 3

我建议使用DateTime.TryParseExact ，它将检查字符串是否符合您想要的格式，如果不是，则返回false，如果是，则返回true并填充您的日期。

Answer 4

You should go with DateTime.TryParseExact , as this method doesn't throws an exception for invalid dates:

DateTime parsed;
var input = "08/03/2013 08:30AM";
if (DateTime.TryParseExact(input, "MM/dd/yyyy hh:mmtt", CultureInfo.InvariantCulture, DateTimeStyles.None, out parsed))
    Console.WriteLine("ok");
else
    Console.WriteLine("not ok");