DateTime.TryParseExact 并解析多种日期格式

Question

I am trying to see if a string is a valid date. I am having trouble since the dates are in "2011–7–17 23:18:52" format. I am testing like so:

String lstrTime = "2011–7–17 23:18:52";
DateTime datevalue; 
CultureInfo enUS = new CultureInfo("en-US");
if (DateTime.TryParseExact(lstrTime, "yyyy-MM-dd hh:mm:ss", enUS,
                     DateTimeStyles.None, out datevalue))
                        {
                            rtxtOutput.Text += "Valid datetime: " + lstrTime;
                        }

I think the reason I am having trouble is because the date can have only 1 M value or 2 MM for months. I have bulk data to process, and changing out the M to MM wont happen.

Edit: I have tried all suggested link, perhaps it could be the cultureinfo not recognizing a 24 hour clock(questionmark)

Answer 1

你需要使用24小时的时间，即大写字母H，“yyyy-MM-dd HH：mm：ss”。

Answer 2

You could try the overload:

TryParseExact(String, String[], IFormatProvider, DateTimeStyles, DateTime)

https://docs.microsoft.com/en-us/dotnet/api/system.datetime.tryparseexact?view=net-6.0#system-datetime-tryparseexact(system-string-system-string-system-iformatprovider-system-globalization-datetimestyles-system-datetime@)