DateTime formats used in InvariantCulture

问题:

I have to pre-validate in Javascript a string that will be a DateTime in c#. The DateTime parse uses InvariantCulture.

Does anyone know the DateTime formats defined for InvariantCulture?

回答1:

Compiling information from here: https://docs.microsoft.com/en-us/dotnet/standard/base-types/standard-date-and-time-format-strings

• Short Date Pattern ("d"): MM/dd/yyyy
• Long Date Pattern ("D"): dddd, dd MMMM yyyy
• Full Date Short Time ("f"): dddd, dd MMMM yyyy HH:mm
• Full Date Long Time ("F"): dddd, dd MMMM yyyy HH:mm:ss
• General Date Short Time ("g"): MM/dd/yyyy HH:mm
• General Date Long Time ("G"): MM/dd/yyyy HH:mm:ss
• Month ("M", "m"): MMMM dd
• Round-Trip ("O", "o"): yyyy-MM-ddTHH:mm:ss.fffffffK
• RFC1123 ("R", "r"): ddd, dd MMM yyyy HH:mm:ss GMT
• Sortable ("s"): yyyy-MM-ddTHH:mm:ss
• Short Time ("t"): HH:mm
• Long Time ("T"): HH:mm:ss
• Universal Sortable ("u"): yyyy-MM-dd HH:mm:ssZ
• Universal Full ("U"): dddd, dd MMMM yyyy HH:mm:ss
• Year Month ("Y", "y"): yyyy MMMM

回答2:

It's very easy to test.

public static void Main()
{
    var d = DateTime.Now;

    Console.WriteLine("Date format (long):  {0}", d.ToString("D", CultureInfo.InvariantCulture));
    Console.WriteLine("Date format (short): {0}", d.ToString("d", CultureInfo.InvariantCulture));
    Console.WriteLine("Full format (long):  {0}", d.ToString("F", CultureInfo.InvariantCulture));
    Console.WriteLine("Full format (short): {0}", d.ToString("f", CultureInfo.InvariantCulture));
    Console.WriteLine("Time format (long):  {0}", d.ToString("T", CultureInfo.InvariantCulture));
    Console.WriteLine("Time format (short): {0}", d.ToString("t", CultureInfo.InvariantCulture));
    Console.WriteLine("General format (long):  {0}", d.ToString("G", CultureInfo.InvariantCulture));
    Console.WriteLine("General format (short): {0}", d.ToString("g", CultureInfo.InvariantCulture));
}

}

Output:

Date format (long):  Monday, 16 October 2017
Date format (short): 10/16/2017
Full format (long):  Monday, 16 October 2017 20:12:45
Full format (short): Monday, 16 October 2017 20:12
Time format (long):  20:12:45
Time format (short): 20:12
General format (long):  10/16/2017 20:12:45
General format (short): 10/16/2017 20:12

Code on DotNetFiddle.

回答3:

Its more or less the same as en-us but uses as 24 hour time instead of 12 hour am/pm and fills in full MM/DD/YYYY.

var date1 = d.ToString(CultureInfo.InvariantCulture);   // "05/21/2014 22:09:28"
var date2 = d.ToString(new CultureInfo("en-US"));       // "5/21/2014 10:09:28 PM"

回答4:

• "O" or "o": yyyy-MM-ddTHH:mm:ss.fffffffzz
• "R" or "r": ddd, dd MMM yyyy HH:mm:ss
• "s": yyyy-MM-ddTHH:mm:ss
• "u": yyyy-MM-dd HH:mm:ssZ

Sources [1]: https://docs.microsoft.com/en-us/dotnet/standard/base-types/standard-date-and-time-format-strings