如何在C＃中将2015年2月19日，22：19：50转换为2015年2月19日22:19:50？

Question

How can I convert Feb 19, 2015,22:19:50 to 2/19/2015 22:19:50 in C#?

I have tried something like below

DateTime dateTime = DateTime.ParseExact("Feb 19, 2015,22:19:50",
                                        "MMM dd, yyyy;HH:mm:ss",
                                        CultureInfo.InvariantCulture);

But I got following error

A first chance exception of type 'System.FormatException' occurred in mscorlib.dll Additional information: String was not recognized as a valid DateTime."

Answer 1

First of all, your string and format doesn't match exactly . In your string, you have a comma between your years and hours, but in your format you have a semicolon. When you have a custom parsing with DateTime.ParseExact or DateTime.TryParseExact methods, your string and format must match exactly based on IFormatProvider you use.

After you parse your string correctly, you can format it with .ToString() method wih M/dd/yyyy HH:mm:ss format and a culture that have / as a DateSeparator and : as a TimeSeparator like InvariantCulture .

string s = "Feb 19, 2015,22:19:50";
DateTime dt;
if(DateTime.TryParseExact(s, "MMM dd, yyyy,HH:mm:ss", CultureInfo.InvariantCulture,
                          DateTimeStyles.None, out dt))
{
   Console.WriteLine(dt.ToString("M/dd/yyyy HH:mm:ss", CultureInfo.InvariantCulture));
   // 2/19/2015 22:19:50
}

Here a demonstration .