62

我正在尝试解析类似于以下内容的国际日期时间字符串:

24-okt-08 21:09:06 CEST

到目前为止,我有类似的东西:

CultureInfo culture = CultureInfo.CreateSpecificCulture("nl-BE");
DateTime dt = DateTime.ParseExact("24-okt-08 21:09:06 CEST",
    "dd-MMM-yy HH:mm:ss ...", culture);

问题是我应该为格式字符串中的“...”使用什么?查看自定义日期和时间格式字符串MSDN 页面似乎没有列出用于解析 PST/CEST/GMT/UTC 形式的时区的格式字符串。

4

6 回答 6

41

AFAIK 时区缩写无法识别。但是,如果您将缩写替换为时区偏移量,就可以了。例如:

DateTime dt1 = DateTime.ParseExact("24-okt-08 21:09:06 CEST".Replace("CEST", "+2"), "dd-MMM-yy HH:mm:ss z", culture);
DateTime dt2 = DateTime.ParseExact("24-okt-08 21:09:06 CEST".Replace("CEST", "+02"), "dd-MMM-yy HH:mm:ss zz", culture);
DateTime dt3 = DateTime.ParseExact("24-okt-08 21:09:06 CEST".Replace("CEST", "+02:00"), "dd-MMM-yy HH:mm:ss zzz", culture);
于 2008-10-28T00:51:36.023 回答
30

快速的答案是,你不能这样做。


这就是为什么,

有一个权威的世界时区数据库,您可以从IANA获得它。

问题是,3 或 4 个字母的缩写与 IANA 时区具有多对一的关联。例如"AMT",意味着不同的东西,这取决于您的文化、您所处的世界的哪个部分以及您的应用程序的上下文。

AMT "Armenia Time" Asia          UTC + 4 hours 
AMT "Amazon Time"  South America UTC - 4 hours 

如果你真的想解决这个问题,我建议使用Noda Time来代表你Instance的 s。您必须编写一些代码来将缩写转换为标准 IANA 时区。

我们不能为您执行此操作,这取决于您的应用程序的上下文。


另一个很好的例子是"CST"

CST "China Standard Time"   Asia            UTC + 8 hours 
CST "Central Standard Time" Central America UTC - 6 hours 
CST "Cuba Standard Time"    Caribbean       UTC - 5 hours 
CST "Central Standard Time" North America   UTC - 6 hours 
于 2014-04-04T16:58:23.797 回答
15

如果您决定采用搜索和替换路线(我做过),请使用缩写字典。

Dictionary<string, string> _timeZones = new Dictionary<string, string>() {
            {"ACDT", "+1030"},
            {"ACST", "+0930"},
            {"ADT", "-0300"},
            {"AEDT", "+1100"},
            {"AEST", "+1000"},
            {"AHDT", "-0900"},
            {"AHST", "-1000"},
            {"AST", "-0400"},
            {"AT", "-0200"},
            {"AWDT", "+0900"},
            {"AWST", "+0800"},
            {"BAT", "+0300"},
            {"BDST", "+0200"},
            {"BET", "-1100"},
            {"BST", "-0300"},
            {"BT", "+0300"},
            {"BZT2", "-0300"},
            {"CADT", "+1030"},
            {"CAST", "+0930"},
            {"CAT", "-1000"},
            {"CCT", "+0800"},
            {"CDT", "-0500"},
            {"CED", "+0200"},
            {"CET", "+0100"},
            {"CEST", "+0200"},
            {"CST", "-0600"},
            {"EAST", "+1000"},
            {"EDT", "-0400"},
            {"EED", "+0300"},
            {"EET", "+0200"},
            {"EEST", "+0300"},
            {"EST", "-0500"},
            {"FST", "+0200"},
            {"FWT", "+0100"},
            {"GMT", "GMT"},
            {"GST", "+1000"},
            {"HDT", "-0900"},
            {"HST", "-1000"},
            {"IDLE", "+1200"},
            {"IDLW", "-1200"},
            {"IST", "+0530"},
            {"IT", "+0330"},
            {"JST", "+0900"},
            {"JT", "+0700"},
            {"MDT", "-0600"},
            {"MED", "+0200"},
            {"MET", "+0100"},
            {"MEST", "+0200"},
            {"MEWT", "+0100"},
            {"MST", "-0700"},
            {"MT", "+0800"},
            {"NDT", "-0230"},
            {"NFT", "-0330"},
            {"NT", "-1100"},
            {"NST", "+0630"},
            {"NZ", "+1100"},
            {"NZST", "+1200"},
            {"NZDT", "+1300"},
            {"NZT", "+1200"},
            {"PDT", "-0700"},
            {"PST", "-0800"},
            {"ROK", "+0900"},
            {"SAD", "+1000"},
            {"SAST", "+0900"},
            {"SAT", "+0900"},
            {"SDT", "+1000"},
            {"SST", "+0200"},
            {"SWT", "+0100"},
            {"USZ3", "+0400"},
            {"USZ4", "+0500"},
            {"USZ5", "+0600"},
            {"USZ6", "+0700"},
            {"UT", "-0000"},
            {"UTC", "-0000"},
            {"UZ10", "+1100"},
            {"WAT", "-0100"},
            {"WET", "-0000"},
            {"WST", "+0800"},
            {"YDT", "-0800"},
            {"YST", "-0900"},
            {"ZP4", "+0400"},
            {"ZP5", "+0500"},
            {"ZP6", "+0600"}
        };
于 2015-05-18T12:46:03.530 回答
3

我有两个答案,因为我不确定你在问什么。

1)我看到您正在使用 CultureInfo,因此,如果您只想将日期和时间格式化 为特定于文化的格式,我会将日期/时间和时区分开,在日期/时间上应用文化方法并附加时区。如果“CEST”对于不同的文化是不同的,你将不得不通过列出所有的选项来改变它(也许在一个案例陈述中)。

2) 如果您想将日期/时间转换为另一个时区,则不能使用 CultureInfo,

我建议阅读:http: //msdn.microsoft.com/en-us/library/ms973825.aspx

您还可以使用 .net framework 3.5 类 TimeZoneInfo(不同于 TimeZone)让您的生活更轻松。

http://msdn.microsoft.com/en-us/library/system.timezoneinfo.aspx

于 2008-10-28T03:18:23.700 回答
1

这是如何:

  1. 获取字符串(前提条件:格式:ddd,dd MMM yyyy HH:mm:ss zzz)
  2. 获取最后一个空格
  3. 从字符串中删除 zzz,但保存 zzz 的值
  4. zzz 的查找偏移量
  5. 将偏移量添加到字符串
string dateString = reader.ReadContentAsString();
int timeZonePos = dateString.LastIndexOf(' ') + 1;
string tz = dateString.Substring(timeZonePos);
dateString = dateString.Substring(0, dateString.Length - tz.Length );
dateString += s_timeZoneOffsets[tz];

// https://msdn.microsoft.com/en-us/library/w2sa9yss(v=vs.110).aspx
//string es = reader.ReadElementString("pubDate");
this.m_value = System.DateTime.ParseExact(dateString, "ddd, dd MMM yyyy HH:mm zzz", System.Globalization.CultureInfo.InvariantCulture);

private static System.Collections.Generic.Dictionary<string, string> s_timeZoneOffsets =
    new System.Collections.Generic.Dictionary<string, string>() {
    {"ACDT", "+10:30"},
    {"ACST", "+09:30"},
    {"ADT", "-03:00"},
    {"AEDT", "+11:00"},
    {"AEST", "+10:00"},
    {"AHDT", "-09:00"},
    {"AHST", "-10:00"},
    {"AST", "-04:00"},
    {"AT", "-02:00"},
    {"AWDT", "+09:00"},
    {"AWST", "+08:00"},
    {"BAT", "+03:00"},
    {"BDST", "+02:00"},
    {"BET", "-11:00"},
    {"BST", "-03:00"},
    {"BT", "+03:00"},
    {"BZT2", "-03:00"},
    {"CADT", "+10:30"},
    {"CAST", "+09:30"},
    {"CAT", "-10:00"},
    {"CCT", "+08:00"},
    {"CDT", "-05:00"},
    {"CED", "+02:00"},
    {"CET", "+01:00"},
    {"CEST", "+02:00"},
    {"CST", "-06:00"},
    {"EAST", "+10:00"},
    {"EDT", "-04:00"},
    {"EED", "+03:00"},
    {"EET", "+02:00"},
    {"EEST", "+03:00"},
    {"EST", "-05:00"},
    {"FST", "+02:00"},
    {"FWT", "+01:00"},
    {"GMT", "+00:00"},
    {"GST", "+10:00"},
    {"HDT", "-09:00"},
    {"HST", "-10:00"},
    {"IDLE", "+12:00"},
    {"IDLW", "-12:00"},
    {"IST", "+05:30"},
    {"IT", "+03:30"},
    {"JST", "+09:00"},
    {"JT", "+07:00"},
    {"MDT", "-06:00"},
    {"MED", "+02:00"},
    {"MET", "+01:00"},
    {"MEST", "+02:00"},
    {"MEWT", "+01:00"},
    {"MST", "-07:00"},
    {"MT", "+08:00"},
    {"NDT", "-02:30"},
    {"NFT", "-03:30"},
    {"NT", "-11:00"},
    {"NST", "+06:30"},
    {"NZ", "+11:00"},
    {"NZST", "+12:00"},
    {"NZDT", "+13:00"},
    {"NZT", "+12:00"},
    {"PDT", "-07:00"},
    {"PST", "-08:00"},
    {"ROK", "+09:00"},
    {"SAD", "+10:00"},
    {"SAST", "+09:00"},
    {"SAT", "+09:00"},
    {"SDT", "+10:00"},
    {"SST", "+02:00"},
    {"SWT", "+01:00"},
    {"USZ3", "+04:00"},
    {"USZ4", "+05:00"},
    {"USZ5", "+06:00"},
    {"USZ6", "+07:00"},
    {"UT", "-00:00"},
    {"UTC", "-00:00"},
    {"UZ10", "+11:00"},
    {"WAT", "-01:00"},
    {"WET", "-00:00"},
    {"WST", "+08:00"},
    {"YDT", "-08:00"},
    {"YST", "-09:00"},
    {"ZP4", "+04:00"},
    {"ZP5", "+05:00"},
    {"ZP6", "+06:00"}
};
于 2018-03-13T09:26:05.683 回答
-1

这是我必须做的。

我从 javascript 接收日期时间,然后将其传递给 ASP.NET 以存储在 Oracle 数据库中。这是我的东部和中部时代的 C# 代码。

string datetimevalue = hidfileDateTime.Value; 

datetimevalue= datetimevalue.Replace("EDT", "EST"); 
datetimevalue = datetimevalue.Replace("CDT", "CST");
if (datetimevalue.Contains("CST"))
{
    filedt = DateTime.ParseExact(datetimevalue, "ddd MMM d HH:mm:ss CST yyyy", provider).ToUniversalTime().AddHours(1).ToLocalTime();
}
else
{
    filedt = DateTime.ParseExact(datetimevalue, "ddd MMM d HH:mm:ss EST yyyy", provider);
}
于 2011-10-05T13:44:16.750 回答