InvariantCulture 中使用的日期时间格式

Question

我必须在 Javascript 中预先验证一个在 C# 中将成为 DateTime 的字符串。 DateTime 解析使用 InvariantCulture。

有人知道为 InvariantCulture 定义的 DateTime 格式吗？

Answer 1

它或多或少与 en-us 相同，但使用 24 小时制而不是 12 小时制 am/pm 并填写完整 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"

Answer 2

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

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

Answer 3

非常容易测试。

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));
}

}

输出：

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

DotNetFiddle 上的代码。

Answer 4

编译来自standard date and time format strings的信息：

Pattern	Example
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`

InvariantCulture 中使用的日期时间格式

DateTime formats used in InvariantCulture

c#

datetime-format

invariantculture