C# 如何将 DateTime 格式化为 Web UTC 格式？
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How can I format DateTime to web UTC format?
提问by Grzenio
I have a DateTime which I want to format to "2009-09-01T00:00:00.000Z", but the following code gives me "2009-09-01T00:00:00.000+01:00" (both lines):
我有一个日期时间，我想将其格式化为“ 2009-09-01T00:00:00.000Z”，但以下代码给了我“ 2009-09-01T00:00:00.000+01:00”（两行）：
new DateTime(2009, 9, 1, 0, 0, 0, 0, DateTimeKind.Utc).ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffzzz")
new DateTime(2009, 9, 1, 0, 0, 0, 0, DateTimeKind.Utc).ToUniversalTime().ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffzzz")
Any ideas how to make it work?
任何想法如何使它工作？
采纳答案by LukeH
string foo = yourDateTime.ToUniversalTime()
.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fff'Z'");
回答by Ian P
Try this:
尝试这个：
DateTime date = DateTime.ParseExact(
"Tue, 1 Jan 2008 00:00:00 UTC",
"ddd, d MMM yyyy HH:mm:ss UTC",
CultureInfo.InvariantCulture);
回答by Nick Berardi
You want to use DateTimeOffsetclass.
您想使用DateTimeOffset类。
var date = new DateTimeOffset(2009, 9, 1, 0, 0, 0, 0, new TimeSpan(0L));
var stringDate = date.ToString("u");
sorry I missed your original formatting with the miliseconds
对不起，我错过了你的原始格式，以毫秒为单位
var stringDate = date.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fff'Z'");
回答by Carlos Beppler
The best format to use is "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffK".
最好使用的格式是“yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffK”。
The last K on string will be changed to 'Z' if the date is UTC or with timezone (+-hh:mm) if is local. (http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx)
如果日期是 UTC 或带有时区 (+-hh:mm) 如果是本地日期，则字符串上的最后一个 K 将更改为“Z”。( http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx)
As LukeH said, is good to use the ToUniversalTime if you want that all the dates will be UTC.
正如 LukeH 所说，如果您希望所有日期都是 UTC，最好使用 ToUniversalTime。
The final code is:
最后的代码是：
string foo = yourDateTime.ToUniversalTime()
.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffK");
回答by Dmitry Pavlov
Why don't just use The Round-trip ("O", "o") Format Specifier?
为什么不直接使用往返 ("O", "o") 格式说明符？
The "O" or "o" standard format specifier represents a custom date and time format string using a pattern that preserves time zone information and emits a result string that complies with ISO 8601. For DateTime values, this format specifier is designed to preserve date and time values along with the DateTime.Kind property in text. The formatted string can be parsed back by using the DateTime.Parse(String, IFormatProvider, DateTimeStyles) or DateTime.ParseExact method if the styles parameter is set to DateTimeStyles.RoundtripKind.
The "O" or "o" standard format specifier corresponds to the "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffffffK" custom format string for DateTime values and to the "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffffffzzz" custom format string for DateTimeOffset values. In this string, the pairs of single quotation marks that delimit individual characters, such as the hyphens, the colons, and the letter "T", indicate that the individual character is a literal that cannot be changed. The apostrophes do not appear in the output string.
The O" or "o" standard format specifier (and the "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffffffK" custom format string) takes advantage of the three ways that ISO 8601 represents time zone information to preserve the Kind property of DateTime values:
"O" 或 "o" 标准格式说明符表示使用保留时区信息并发出符合 ISO 8601 的结果字符串的模式的自定义日期和时间格式字符串。对于 DateTime 值，此格式说明符旨在保留日期和时间值以及文本中的 DateTime.Kind 属性。如果样式参数设置为 DateTimeStyles.RoundtripKind，则可以使用 DateTime.Parse(String, IFormatProvider, DateTimeStyles) 或 DateTime.ParseExact 方法解析格式化的字符串。
“O”或“o”标准格式说明符对应于 DateTime 值的“yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffffffK”自定义格式字符串以及“yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'ffffffffzzz”DateTimeOffset 值的自定义格式字符串。在此字符串中，分隔单个字符的单引号对（例如连字符、冒号和字母“T”）表示单个字符是无法更改的文字。撇号不会出现在输出字符串中。
O" 或 "o" 标准格式说明符（以及 "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffffffK" 自定义格式字符串）利用了三种方式ISO 8601 表示时区信息以保留 DateTime 值的 Kind 属性：
public class Example
{
public static void Main()
{
DateTime dat = new DateTime(2009, 6, 15, 13, 45, 30,
DateTimeKind.Unspecified);
Console.WriteLine("{0} ({1}) --> {0:O}", dat, dat.Kind);
DateTime uDat = new DateTime(2009, 6, 15, 13, 45, 30,
DateTimeKind.Utc);
Console.WriteLine("{0} ({1}) --> {0:O}", uDat, uDat.Kind);
DateTime lDat = new DateTime(2009, 6, 15, 13, 45, 30,
DateTimeKind.Local);
Console.WriteLine("{0} ({1}) --> {0:O}\n", lDat, lDat.Kind);
DateTimeOffset dto = new DateTimeOffset(lDat);
Console.WriteLine("{0} --> {0:O}", dto);
}
}
// The example displays the following output:
// 6/15/2009 1:45:30 PM (Unspecified) --> 2009-06-15T13:45:30.0000000
// 6/15/2009 1:45:30 PM (Utc) --> 2009-06-15T13:45:30.0000000Z
// 6/15/2009 1:45:30 PM (Local) --> 2009-06-15T13:45:30.0000000-07:00
//
// 6/15/2009 1:45:30 PM -07:00 --> 2009-06-15T13:45:30.0000000-07:00
回答by user3228938
Some people have pointed out that ‘ToUniversalTime' is somewhat unsafe in that it can cause unintended incorrect time dispalys. Expanding on that I'm providing a more detailed example of a solution. The sample here creates an extension to the DateTime object that safely returns a UTC DateTime where you can use ToString as desired….
有些人指出“ToUniversalTime”有点不安全，因为它会导致意外的不正确时间显示。对此，我提供了一个更详细的解决方案示例。此处的示例创建了 DateTime 对象的扩展，该对象安全地返回 UTC 日期时间，您可以在其中根据需要使用 ToString...。
class Program
{
static void Main(string[] args)
{
DateTime dUtc = new DateTime(2016, 6, 1, 3, 17, 0, 0, DateTimeKind.Utc);
DateTime dUnspecified = new DateTime(2016, 6, 1, 3, 17, 0, 0, DateTimeKind.Unspecified);
//Sample of an unintended mangle:
//Prints "2016-06-01 10:17:00Z"
Console.WriteLine(dUnspecified.ToUniversalTime().ToString("u"));
//Prints "2016 - 06 - 01 03:17:00Z"
Console.WriteLine(dUtc.SafeUniversal().ToString("u"));
//Prints "2016 - 06 - 01 03:17:00Z"
Console.WriteLine(dUnspecified.SafeUniversal().ToString("u"));
}
}
public static class ConvertExtensions
{
public static DateTime SafeUniversal(this DateTime inTime)
{
return (DateTimeKind.Unspecified == inTime.Kind)
? new DateTime(inTime.Ticks, DateTimeKind.Utc)
: inTime.ToUniversalTime();
}
}
回答by arviman
string.Format("{0:yyyy-MM-ddTHH:mm:ss.FFFZ}", DateTime.UtcNow)
returns 2017-02-10T08:12:39.483Z
返回 2017-02-10T08:12:39.483Z
回答by Ergin ?elik
This code is working for me:
这段代码对我有用：
var datetime = new DateTime(2017, 10, 27, 14, 45, 53, 175, DateTimeKind.Local);
var text = datetime.ToString("o");
Console.WriteLine(text);
-- 2017-10-27T14:45:53.1750000+03:00
// datetime from string
var newDate = DateTime.ParseExact(text, "o", null);
