问题:

I am getting a String.FormatException trying to convert/parse a string when the culture is other than non-US. The odd thing is that the string was generated by applying the very same format and culture as those being used to parse it back into a string. In the code below, all of these versions will fail:

const string culture = "ja-JP"; const string format = "dd MMM yyyy"; //error in orignal post included {0:} CultureInfo info = new CultureInfo(culture); Thread.CurrentThread.CurrentCulture = info; Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture(culture);  //string toParse = String.Format(info, format, DateTime.Now); //error in original post string toParse = DateTime.Now.ToString(format); System.Diagnostics.Debug.WriteLine(string.Format("Culture format = {0}, Date = {1}", culture, toParse)); try {     DateTime output = DateTime.ParseExact(toParse, format, CultureInfo.InvariantCulture);     //DateTime output = DateTime.ParseExact(toParse, format, info);     //DateTime output = DateTime.ParseExact(toParse, format, info, DateTimeStyles.None);     //DateTime output = Convert.ToDateTime(toParse, info); } catch (Exception ex) {     System.Diagnostics.Debug.WriteLine(ex.Message); }

Note that the string for en-US is "25 Feb 2010". The string for ja-JP is "25 2 2010".

Any idea how to get "25 2 2010" back into a date?

Thanks in advance.

Edit1: I should note that the Japanese culture is hard-coded here only as an example. I really need this to work with whatever culture is set by the user. What I need is a solution where the date time format works no matter what the user's culture. I think the single M does it.

Edit 2: M doesn't work for English. Anyone know a format string that works for all cultures?

回答1:

If you change:

DateTime output = DateTime.ParseExact(     toParse, format, CultureInfo.InvariantCulture);

DateTime output = DateTime.ParseExact(toParse, "dd MMM yyyy", info);

the date is correctly parsed.

Note that in your example you are using a culture (ja-JP) to convert to string but another culture to convert from string. Another problem is that String.Format accepts a composite format string ("My string to format - {0:dd MMM yyyy}"), but DateTime.ParseExact is expecting only the date time format.

回答2:

Try using a single M when parsing the date. That is what is used in the example for the MonthDayPattern for Japanese culture.

const string format = "{0:dd M yyyy}";

回答3:

string text = "25 2 2009"; DateTime date = DateTime.ParseExact(text, "d M yyyy", CultureInfo.InvariantCulture);

回答4:

The format pattern you pass to DateTime.ParseExact has to be just the date pattern, without the placeholder. And for JP culture, you need to use just one M since the dates are represented by numbers even when MMM is specified when converting to a string.

        const string culture = "ja-JP";         const string FROM_STRING_FORMAT = "dd M yyyy";         const string TO_STRING_FORMAT = "{0:" + FROM_STRING_FORMAT + "}";         CultureInfo info = new CultureInfo(culture);         Thread.CurrentThread.CurrentCulture = info;         Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture(culture);          string toParse = String.Format(info, TO_STRING_FORMAT, DateTime.Now);         Console.WriteLine(string.Format("Culture format = {0}, Date = {1}", culture, toParse));         try         {             DateTime output = DateTime.ParseExact(toParse, FROM_STRING_FORMAT, CultureInfo.InvariantCulture);             Console.WriteLine(output);         }         catch (Exception ex)         {             Console.WriteLine(ex.Message);         }

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