Parsing Integer Value As Datetime

Question

I have date represented as integer like 20140820 and I want to parsing it as datetime, like 2014.08.20.

Do I need to parse each integer value (2014)(08)

Answer 1

The easiest and most performance way would be something like:

int date = 20140820;

int d = date % 100;
int m = (date / 100) % 100;
int y = date / 10000;

var result = new DateTime(y, m, d);

Answer 2

If your CurrentCulture supports yyyyMMdd format as a standard date and time format, you can just use DateTime.Parse method like;

int i = 20140820;
DateTime dt = DateTime.Parse(i.ToString());

If it doesn't support, you need to use DateTime.ParseExact or DateTime.TryParseExact methods to parse it as custom date and time format.

int i = 20140820;
DateTime dt;
if(DateTime.TryParseExact(i.ToString(), "yyyyMMdd", 
                          CultureInfo.InvariantCulture,
                          DateTimeStyles.None, out dt))
{
    Console.WriteLine(dt);
}

Then you can format your DateTime with .ToString() method like;

string formattedDateTime = dt.ToString("yyyy.MM.dd", CultureInfo.InvariantCulture);

Answer 3

Try This :-

string time = "20140820";
DateTime theTime= DateTime.ParseExact(time,
                                    "yyyyMMdd",
                                    CultureInfo.InvariantCulture,
                                    DateTimeStyles.None);

---

OR

string str = "20140820";
string[] format = {"yyyyMMdd"};
DateTime date;

DateTime.TryParseExact(str, 
                          format, 
                          System.Globalization.CultureInfo.InvariantCulture,
                          System.Globalization.DateTimeStyles.None, 
                          out date))

now date variable will have required converted date of string '20140820'