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使用格式为pst/cest/utc/etc的时区分析日期时间

timezone datetime parsing .net c#

thelsdj · 技术社区 · 18 年前

我试图分析一个国际日期时间字符串,类似于:

24-okt-08 21:09:06 CEST

到目前为止,我得到了如下的东西:

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,我应该对格式字符串中的“…”使用什么?看着 Custom Date and Time Format String msdn页面似乎没有列出用于以pst/cest/gmt/utc格式分析时区的格式字符串。

6 回复 | 直到 7 年前

Panos 18 年前

afaik时区缩写无法识别。但是,如果将缩写替换为时区偏移,则可以。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);

Jodrell 8 年前

快速的答案是,你做不到。

这就是为什么,

有一个世界时区的权威数据库,您可以从 IANA here .

问题是,3或4个字母的缩写与IANA时区有多对一的关联。例如 "AMT" 意味着不同的事情,这取决于您的文化、您所处的世界的哪一部分以及应用程序的上下文。

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 代表你的 Instance 你必须写一些代码来把缩写转换成标准的IANA时区。

我们不能为您这样做,这取决于应用程序的上下文。

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

Jussi Palo 10 年前

如果您决定进行搜索和替换路径,请使用缩写字典(我做过)。

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"}
        };

makstaks 18 年前

我有两个答案,因为我不确定你在问什么。

1)我看到你在使用CultureInfo,所以如果你只是想格式日期和时间是特定于区域性的,我将分隔日期/时间和时区,在日期/时间应用区域性方法并附加时区。如果“CEST”在不同的文化中是不同的,则必须通过列出所有选项(可能在case语句中)来更改它。

2)如果要将日期/时间转换为其他时区,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(与TimeZone不同)来简化您的生活。

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

jpmc26 7 年前

这就是如何:

获取字符串(前提条件:格式:ddd,dd-mmm-yyyy hh:mm:ss-zzz)
获取最后一个空白
从字符串中删除zzz,但保存zzz的值
ZZZ的查找偏移量
向字符串添加偏移量

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);

具有

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"}
};

-1

luke 13 年前

这就是我必须做的。

我从javascript接收日期时间,然后将其传递到ASP.NET以存储在Oracle数据库中。这是我的东部和中部时间的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);
}