我有以下格式的日期字符串
Fri, 14 Dec 2012 6:52 am PST
我想将其转换为日期时间。我正在使用DateTime.TryParseExact来实现它，但我无法读取时区。如果我将字符串（没有时区）更改为
Fri, 14 Dec 2012 6:52 am
并使用
DateTime.TryParseExact(DateString, "ddd, dd MMM yyyy h:mm tt", CultureInfo.InvariantCulture, DateTimeStyles.None,out dt)
它有效。 我该如何阅读时区。
编辑 - 我从雅虎天气API获取数据（例如http://weather.yahooapis.com/forecastrss?w=2420380）。
感谢。
答案 0 :(得分：7)
我不相信有custom date and time format specifier处理时区（而不是当前的UTC偏移）。即使有，时区缩写也可能含糊不清，因此它们通常很差，作为沟通时区信息的一种方式。不幸的是，它们被广泛使用，当然......
我怀疑你最好创建一个从缩写到“最佳猜测时区”的地图，然后在输入字符串的最后一个空格之后剥离任何内容，并使用它来获取区域。
万一有人想知道，Noda Time也没有处理这个问题 - 但我希望在某些方面取得进展：）
答案 1 :(得分：5)
是的，这是不可能的，但它不是问题的解决方案。所以我所做的是试图找到arunlalam的解决方案：）
这是（更新：更正的时区 - / +）：
public static string[][] TimeZones = new string[][] {
new string[] {"ACDT", "+1030", "Australian Central Daylight"},
new string[] {"ACST", "+0930", "Australian Central Standard"},
new string[] {"ADT", "-0300", "(US) Atlantic Daylight"},
new string[] {"AEDT", "+1100", "Australian East Daylight"},
new string[] {"AEST", "+1000", "Australian East Standard"},
new string[] {"AHDT", "-0900", ""},
new string[] {"AHST", "-1000", ""},
new string[] {"AST", "-0400", "(US) Atlantic Standard"},
new string[] {"AT", "-0200", "Azores"},
new string[] {"AWDT", "+0900", "Australian West Daylight"},
new string[] {"AWST", "+0800", "Australian West Standard"},
new string[] {"BAT", "+0300", "Bhagdad"},
new string[] {"BDST", "+0200", "British Double Summer"},
new string[] {"BET", "-1100", "Bering Standard"},
new string[] {"BST", "-0300", "Brazil Standard"},
new string[] {"BT", "+0300", "Baghdad"},
new string[] {"BZT2", "-0300", "Brazil Zone 2"},
new string[] {"CADT", "+1030", "Central Australian Daylight"},
new string[] {"CAST", "+0930", "Central Australian Standard"},
new string[] {"CAT", "-1000", "Central Alaska"},
new string[] {"CCT", "+0800", "China Coast"},
new string[] {"CDT", "-0500", "(US) Central Daylight"},
new string[] {"CED", "+0200", "Central European Daylight"},
new string[] {"CET", "+0100", "Central European"},
new string[] {"CST", "-0600", "(US) Central Standard"},
new string[] {"EAST", "+1000", "Eastern Australian Standard"},
new string[] {"EDT", "-0400", "(US) Eastern Daylight"},
new string[] {"EED", "+0300", "Eastern European Daylight"},
new string[] {"EET", "+0200", "Eastern Europe"},
new string[] {"EEST", "+0300", "Eastern Europe Summer"},
new string[] {"EST", "-0500", "(US) Eastern Standard"},
new string[] {"FST", "+0200", "French Summer"},
new string[] {"FWT", "+0100", "French Winter"},
new string[] {"GMT", "-0000", "Greenwich Mean"},
new string[] {"GST", "+1000", "Guam Standard"},
new string[] {"HDT", "-0900", "Hawaii Daylight"},
new string[] {"HST", "-1000", "Hawaii Standard"},
new string[] {"IDLE", "+1200", "Internation Date Line East"},
new string[] {"IDLW", "-1200", "Internation Date Line West"},
new string[] {"IST", "+0530", "Indian Standard"},
new string[] {"IT", "+0330", "Iran"},
new string[] {"JST", "+0900", "Japan Standard"},
new string[] {"JT", "+0700", "Java"},
new string[] {"MDT", "-0600", "(US) Mountain Daylight"},
new string[] {"MED", "+0200", "Middle European Daylight"},
new string[] {"MET", "+0100", "Middle European"},
new string[] {"MEST", "+0200", "Middle European Summer"},
new string[] {"MEWT", "+0100", "Middle European Winter"},
new string[] {"MST", "-0700", "(US) Mountain Standard"},
new string[] {"MT", "+0800", "Moluccas"},
new string[] {"NDT", "-0230", "Newfoundland Daylight"},
new string[] {"NFT", "-0330", "Newfoundland"},
new string[] {"NT", "-1100", "Nome"},
new string[] {"NST", "+0630", "North Sumatra"},
new string[] {"NZ", "+1100", "New Zealand "},
new string[] {"NZST", "+1200", "New Zealand Standard"},
new string[] {"NZDT", "+1300", "New Zealand Daylight"},
new string[] {"NZT", "+1200", "New Zealand"},
new string[] {"PDT", "-0700", "(US) Pacific Daylight"},
new string[] {"PST", "-0800", "(US) Pacific Standard"},
new string[] {"ROK", "+0900", "Republic of Korea"},
new string[] {"SAD", "+1000", "South Australia Daylight"},
new string[] {"SAST", "+0900", "South Australia Standard"},
new string[] {"SAT", "+0900", "South Australia Standard"},
new string[] {"SDT", "+1000", "South Australia Daylight"},
new string[] {"SST", "+0200", "Swedish Summer"},
new string[] {"SWT", "+0100", "Swedish Winter"},
new string[] {"USZ3", "+0400", "USSR Zone 3"},
new string[] {"USZ4", "+0500", "USSR Zone 4"},
new string[] {"USZ5", "+0600", "USSR Zone 5"},
new string[] {"USZ6", "+0700", "USSR Zone 6"},
new string[] {"UT", "-0000", "Universal Coordinated"},
new string[] {"UTC", "-0000", "Universal Coordinated"},
new string[] {"UZ10", "+1100", "USSR Zone 10"},
new string[] {"WAT", "-0100", "West Africa"},
new string[] {"WET", "-0000", "West European"},
new string[] {"WST", "+0800", "West Australian Standard"},
new string[] {"YDT", "-0800", "Yukon Daylight"},
new string[] {"YST", "-0900", "Yukon Standard"},
new string[] {"ZP4", "+0400", "USSR Zone 3"},
new string[] {"ZP5", "+0500", "USSR Zone 4"},
new string[] {"ZP6", "+0600", "USSR Zone 5"}
};
返回可解析偏移量的函数：
public static string TimeZoneToOffset(string tz)
{
tz = tz.ToUpper().Trim();
for (int i = 0 ; i < TimeZones.Length ; i++)
{
if (((string)((string[])TimeZones.GetValue(i)).GetValue(0)) == tz)
{
return ((string)((string[])TimeZones.GetValue(i)).GetValue(1));
}
}
return System.TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now).ToString()
.Replace(":", "").Substring(0, 5);
}
在这里找到： http://bytes.com/topic/c-sharp/answers/214648-how-do-i-parse-date-w-time-zone
希望它有效:) 祝你有愉快的一天
答案 2 :(得分：2)
PST不是.NET框架的可解析时区 - 时区格式说明符期望数字偏移量，例如-0800。
解决此问题的一种方法是在尝试解析之前将每个时区转换为其数字表示。
答案 3 :(得分：2)
您可以使用偏移量替换时区部分：
string DateString = "Fri, 14 Dec 2012 6:52 am PST";
DateTime dt;
bool parsable = DateTime.TryParseExact(
DateString.Replace("PST", "+2")
, "ddd, dd MMM yyyy h:mm tt z"
, CultureInfo.InvariantCulture
, DateTimeStyles.None
, out dt);