I\'m trying to parse an international datetime string similar to:
24-okt-08 21:09:06 CEST
So far I\'ve got something like:
The quick answer is, you can't do it.
Here is why,
There is a definitive database of world timezones, you can get it from the IANA here.
The problem is, the 3 or 4 letter abbreviations have a many-to-one association with the IANA timezones. For instance "AMT" means different things, depending on your culture, what part of the world you are in and the context of your application.
AMT "Armenia Time" Asia UTC + 4 hours
AMT "Amazon Time" South America UTC - 4 hours
If you really want to tackle this, I suggest using Noda Time to represent your Instance
s. You'll have to write some code to convert the abbreviations to a standard IANA timezone.
We can't do this for you, it depends on the context of your application.
Another good example is "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
Here's what I had to do.
I receive the datetime from javascript and then pass it on to ASP.NET to store in Oracle database. Here is my C# code for Eastern and Central times.
string datetimevalue = hidfileDateTime.Value;
datetimevalue= datetimevalue.Replace("EDT", "EST");
datetimevalue = datetimevalue.Replace("CDT", "CST");
if (datetimevalue.Contains("CST"))
{
filedt = DateTime.ParseExact(datetimevalue, "ffffd MMM d HH:mm:ss CST yyyy", provider).ToUniversalTime().AddHours(1).ToLocalTime();
}
else
{
filedt = DateTime.ParseExact(datetimevalue, "ffffd MMM d HH:mm:ss EST yyyy", provider);
}
I have two answers because I'm not exactly sure what you are asking.
1) I see you are using CultureInfo, so if you just want to format the date and time to be culture specific, I would separate the date/time and timezone, apply culture method on the date/time and append the timezone. If "CEST" is different for different cultures, you will have to change it by listing all the options (maybe in a case statement).
2) If you want date/time to be converted to another timezone, you can't use CultureInfo,
I suggest reading: http://msdn.microsoft.com/en-us/library/ms973825.aspx
You can also use the .net framework 3.5 class TimeZoneInfo (different from TimeZone) to make your life easier.
http://msdn.microsoft.com/en-us/library/system.timezoneinfo.aspx
This is how:
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, "ffffd, dd MMM yyyy HH:mm zzz", System.Globalization.CultureInfo.InvariantCulture);
with
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"}
};
AFAIK the time zone abbreviations are not recognized. However if you replace the abbreviation with the time zone offset, it will be OK. E.g.:
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);
Dictionary of abbreviations if you decide to go the search&replace route (I did).
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"}
};