在C＃中从字符串转换为DateTime

Question

I want to convert a String to Datetime. I'm getting an error This is not a valid datetime .

The string I want to convert and code are as follows.

string date1 = "9/13/2012 5:26:06 PM";
TimePart = DateTime.ParseExact(date1, "M/d/yyyy HH:mm:ss tt", System.Globalization.CultureInfo.InvariantCulture);

Answer 1

我认为您的format参数应该是M/dd/yyyy h:mm:ss tt 。

Answer 2

It looks like your format is really M/d/yyyy h:mm:ss tt . The difference is h (12-hour, with only as many digits as needed) instead of HH (24-hour, with leading 0 to pad to 2 digits).

If the input format can vary at all, you should use DateTime.Parse instead so that you don't have to tell it the exact format. ParseExact is faster, and requires that it matches the specified format, which may be preferable in your cast.

Answer 3

You need to use the lowercase h :

DateTime TimePart = DateTime.ParseExact(
                                date1,
                                "M/d/yyyy h:mm:ss tt",
                                CultureInfo.InvariantCulture);

Console.WriteLine(TimePart); // 09/13/2012 17:26:06

Uppercase "H" is 24-hour time, lowercase "h" is 12-hour time with AM/PM.

Answer 4

You should be using a lower case h for a 12 hour clock (since you have an AM/PM designator).

Additionally, you should only use one h , as you don't have a leading 0 to the hours, and hh expects it.

A format string that works:

"M/d/yyyy h:mm:ss tt"

Answer 5

It looks like the HH isn't matching the "5". Try h .