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)(02) using index or is there simpler way?

Answer 1

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 2

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);