I have put my users through so much crap with this bug it is an absolute
shame.
I have a product that reads/writes RSS 2.0 documents, among other things.
The RSS 2.0 spec mandates an en-US style of date formatting (RFC 822). I
have been using a variation of RFC 1123 (just change the time zone to an
offset, i.e. "-0800"). It seems to be writing okay, but it's failing to
parse.
I've tried changing the regional & language settings in my Windows XP
control panel so that I could test, but after getting it to work that way, a
guy from Pakistan (I think?) is still getting date parsing problems.
Here's what I've got. See ParseDateTime() below.
/// <summary>
/// Currently, this method simply calls DateToRFC1123St ring(),
/// but then changes the time zone to "+/-####", i.e. "-0700".
/// </summary>
public static string DateToRFC822Str ing(DateTime dt, bool
fromLocalTimeZo ne) {
string dts = DateToRFC1123St ring(dt, false);
if (fromLocalTimeZ one) {
string offset = MiscUtil.SysDTO ffset.ToString( );
offset = offset.Replace( ":", "").Replace (" ", "");
if (offset.Substri ng(0, 1) != "-") {
if (offset.Substri ng(0, 1) == "+") {
offset = offset.Substrin g(0, 5);
} else {
offset = "+" + offset.Substrin g(0, 4);
}
} else {
offset = offset.Substrin g(0, 5);
}
dts = dts.Replace("GM T", offset);
}
return dts;
}
public static TimeSpan SysDTOffset {
get {
return System.TimeZone .CurrentTimeZon e.GetUtcOffset( DateTime.Now);
}
}
/// <summary>
/// Converts a time zone (e.g. "PST") to an offset string (e.g. "-0700").
/// </summary>
/// <param name="tz">The time zone to convert.</param>
/// <returns>The offset string (e.g. "-0700").</returns>
public static string TimeZoneToOffse t(string tz) {
tz = tz.ToUpper().Tr im()
.Replace("PACIF IC", "PST")
.Replace("MOUNT AIN", "MST")
.Replace("CENTR AL", "CST")
.Replace("EASTE RN", "EST");
for (int i=0; i<TimeZones.Len gth; i++) {
if (((string)((str ing[])TimeZones.GetV alue(i)).GetVal ue(0)) == tz) {
return ((string)((stri ng[])TimeZones.GetV alue(i)).GetVal ue(1));
}
}
return
System.TimeZone .CurrentTimeZon e.GetUtcOffset( DateTime.Now).T oString()
.Replace(":", "").Substring(0 , 5);
}
public static string OffsetToTimeZon e(string offset) {
foreach (string[] tz in TimeZones) {
if (((string)tz.Ge tValue(1)) == offset) {
return (string)tz.GetV alue(0);
}
}
return "GMT";
}
public static string OffsetToTimeZon e(string offset, bool
isDaylightSavin gs) {
foreach (string[] tz in TimeZones) {
if (((string)tz.Ge tValue(1)) == offset) {
string tzs = (string)tz.GetV alue(0);
if (isDaylightSavi ngs) {
switch (tzs) {
case "PDT":
return tzs;
case "MDT":
return tzs;
case "CDT":
return tzs;
case "EDT":
return tzs;
case "MST":
return "PDT";
case "CST":
return "MDT";
case "EST":
return "CDT";
default:
return tzs;
}
} else {
return tzs;
}
//return;
//return (string)tz.GetV alue(0);
}
}
return "GMT";
}
public static string DateToRFC1123St ring(DateTime dt, bool
fromLocalTimeZo ne) {
if (fromLocalTimeZ one) {
dt = dt.ToUniversalT ime();
}
System.Globaliz ation.CultureIn fo ci = new
System.Globaliz ation.CultureIn fo("en-US", false);
string ret = dt.ToString(ci. DateTimeFormat. RFC1123Pattern, ci);
return ret;
}
/// <summary>
/// Parses dates with time zones in the following formats:
/// "Thu, 17 Jul 2003 12:35:18 PST",
/// "Thu, 17 Jul 2003 12:35:18 -0700".
/// Converts the time to the local time zone.
/// </summary>
/// <param name="dateTime" >The date/time to parse.</param>
/// <returns>A DateTime object</returns>
public static DateTime ParseDateTime(s tring dateTime) {
System.Globaliz ation.CultureIn fo ci = null;
try {
ci = new System.Globaliz ation.CultureIn fo("en-US", false);
return DateTime.Parse( dateTime,
ci,
System.Globaliz ation.DateTimeS tyles.AllowWhit eSpaces);
} catch (FormatExceptio n fex0) {
try {
fex0=fex0; // ignore
return DateTime.Parse( dateTime,
System.Globaliz ation.DateTimeF ormatInfo.Invar iantInfo,
System.Globaliz ation.DateTimeS tyles.AllowWhit eSpaces);
} catch (FormatExceptio n fex) {
try {
try {
string iso8601_date = dateTime;
ci = new System.Globaliz ation.CultureIn fo("en-US", false);
return DateTime.ParseE xact(
iso8601_date,
ci.DateTimeForm at.SortableDate TimePattern,
ci.DateTimeForm at);
} catch {}
string loc = fex.Message.Sub string(fex.Mess age.LastIndexOf (" "));
loc = loc.Substring(0 , loc.LastIndexOf ("."));
string tz = "";
if (loc.Trim() == "DateTime") {
tz = dateTime.Substr ing(dateTime.La stIndexOf(" ")).Trim();
dateTime = dateTime.Substr ing(0, dateTime.Length - tz.Length);
} else {
try {
int iLoc = int.Parse(loc);
tz = dateTime.Substr ing(iLoc);
tz = TimeZoneToOffse t(tz);
dateTime = dateTime.Substr ing(0, iLoc);
} catch {
}
}
ci = new System.Globaliz ation.CultureIn fo("en-US", false);
DateTime ret = DateTime.Parse( dateTime,
ci,
System.Globaliz ation.DateTimeS tyles.AllowWhit eSpaces);
// offset for time zone
if (tz.Length > 0) {
try {
if (tz.Length == 4 && tz.Substring(0, 1) != "-") {
try {
int.Parse(tz.Su bstring(0, 1));
tz = "+" + tz;
} catch {
}
}
if (tz.Length == 5 && tz.Substring(0, 1) == "-" ||
tz.Length == 5 && tz.Substring(0, 1) == "+") {
try {
int h = int.Parse(tz.Su bstring(1, 2));
int m = int.Parse(tz.Su bstring(3, 2));
if (tz.Substring(0 , 1) == "-") {
ret = ret.AddHours((h * -1) - SysDTOffset.Hou rs);
ret = ret.AddMinutes( (m * -1) - SysDTOffset.Min utes);
} else {
ret = ret.AddHours(h - SysDTOffset.Hou rs);
ret = ret.AddMinutes( m - SysDTOffset.Min utes);
}
} catch {
}
}
} catch {}
}
return ret;
} catch {
return new DateTime(0);
}
}
}
}
/// <summary>
/// An array of time zones
/// (e.g. new string[] {"PST", "-0700", "(US) Pacific Standard"}).
/// </summary>
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", "AHDT"},
new string[] {"AHST", "-1000", "AHST"},
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", "Internatio n Date Line East"},
new string[] {"IDLW", "-1200", "Internatio n 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", "Newfoundla nd 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"}
};
Nov 16 '05
14 3688
The exception you describe would be because parseCulture is null. Try making
it en-US?
I'm going to make some subtle changes based on what you experimented ..
Jon
"Ed Courtenay" <re************ *************** **@edcourtenay. co.uk> wrote in
message news:%2******** *******@TK2MSFT NGP11.phx.gbl.. . Jon Davis wrote:
The date string in a test file for one of my guinea pig users is "Thu,
13 May 2004 15:54:25 +0200", which is what my app came up with in the DateToRFC822Str ing() method (see first post in thread).
Sorry, there is no stack trace. I can and may have to rebuild it with
the removal of a quiet try..catch, and have my guinea pig re-download and re-test, but I have burdened him with like five rebuilds of my app for
this bug and I'm so embarrassed..
... If that's the only way, it's the only way *sigh*.
Jon
Well, I hope this will help... ;)
Thread.CurrentT hread.CurrentCu lture = new CultureInfo("ur-PK"); string dateFormat =
CultureInfo.Inv ariantCulture.D ateTimeFormat.R FC1123Pattern.R eplace("'GMT'", "zzz"); string dateString = "Thu, 13 May 2004 15:54:25 +0200"; CultureInfo parseCulture = null; parseCulture = CultureInfo.Inv ariantCulture; DateTime dateTime = DateTime.ParseE xact(dateString .Replace("GMT", "+0000"), dateFormat, parseCulture); Console.WriteLi ne("{0:R}", dateTime);
If you comment out "parseCultu re = CultureInfo.Inv ariantCulture;" you'll get an exception, otherwise this will work as expected.
--
Ed Courtenay [MCP, MCSD] http://www.edcourtenay.co.uk
Jon Davis wrote: is InvariantCultur e based on en-US?
From MSDN:
"The CultureInfo.Inv ariantCulture property is neither a neutral nor a
specific culture. It is a third type of culture that is
culture-insensitive. It is associated with the English language but not
with a country or region. You can use InvariantCultur e in almost any
method in the System.Globaliz ation namespace that requires a culture.
However, you should use the invariant culture only for processes that
require culture-independent results, such as system services. In other
cases, it produces results that might be linguistically incorrect or
culturally inappropriate."
--
Ed Courtenay
[MCP, MCSD] http://www.edcourtenay.co.uk
Jon Davis wrote: The exception you describe would be because parseCulture is null. Try making it en-US?
I'm going to make some subtle changes based on what you experimented ..
Jon
Jon,
I've just looked through the code you provided, and I think I can see
where there's a potential problem.
You're parsing the error message provided by the FormatException to
determine the type of error thrown. In particular, you're assuming that
the message is going to be something like:
"The string was not recognized as a valid DateTime. There is a unknown
word starting at index 26."
or
"The string was not recognized as a valid DateTime."
and handling the last 'word' in the message; you cannot guarantee what
the format of the message will be, and bear in mind that the message
will change depending on the locale of the system. In other words, you
cannot guarantee that the exception is in English!
I'm fairly certain that this is where your problem lies.
--
Ed Courtenay
[MCP, MCSD] http://www.edcourtenay.co.uk
Ed Courtenay wrote: Jon Davis wrote:
The exception you describe would be because parseCulture is null. Try making it en-US?
I'm going to make some subtle changes based on what you experimented ..
Jon
Jon,
I've just looked through the code you provided, and I think I can see where there's a potential problem.
You're parsing the error message provided by the FormatException to determine the type of error thrown. In particular, you're assuming that the message is going to be something like:
"The string was not recognized as a valid DateTime. There is a unknown word starting at index 26."
or
"The string was not recognized as a valid DateTime."
and handling the last 'word' in the message; you cannot guarantee what the format of the message will be, and bear in mind that the message will change depending on the locale of the system. In other words, you cannot guarantee that the exception is in English!
I'm fairly certain that this is where your problem lies.
I've re-written your ParseDateTime function so that it doesn't rely on
the format of the FormatException message; feel free to use/abuse it!
I hope this helps...
public static DateTime ParseDateTime(s tring dateTime)
{
System.Globaliz ation.CultureIn fo ci = CultureInfo.Inv ariantCulture;
try
{
return DateTime.Parse( dateTime, ci, DateTimeStyles. AllowWhiteSpace s);
}
catch (FormatExceptio n)
{
try
{
return DateTime.ParseE xact(dateTime, new string[]
{ci.DateTimeFor mat.SortableDat eTimePattern,
ci.DateTimeForm at.RFC1123Patte rn}, ci, DateTimeStyles. AllowWhiteSpace s);
}
catch (FormatExceptio n)
{
string dateFormat =
ci.DateTimeForm at.RFC1123Patte rn.Replace("'GM T'", "zzz");
foreach(string[] entry in TimeZones)
{
if (dateTime.EndsW ith(entry[0]))
{
dateTime = String.Format(" {0}{1}", dateTime.Substr ing(0,
dateTime.Length - entry[0].Length), entry[1]);
break; }
}
try
{
return DateTime.ParseE xact(dateTime, dateFormat, ci,
DateTimeStyles. AllowWhiteSpace s);
}
catch (FormatExceptio n)
{
return DateTime.Now;
}
}
}
}
--
Ed Courtenay
[MCP, MCSD] http://www.edcourtenay.co.uk
Thanks, Ed!
The major change to be made was to pass the dateFormat param (with GMT'
changed to zzz) to ParseExact(), which you describe below, and my guinea pig
user reports that this change works (just before I got your e-mail). So
thanks very much, glad to see confirmation.
Jon
"Ed Courtenay" <re************ *************** **@edcourtenay. co.uk> wrote in
message news:eB******** ******@TK2MSFTN GP11.phx.gbl... Ed Courtenay wrote:
Jon Davis wrote:
The exception you describe would be because parseCulture is null. Try making it en-US?
I'm going to make some subtle changes based on what you experimented ..
Jon
Jon,
I've just looked through the code you provided, and I think I can see where there's a potential problem.
You're parsing the error message provided by the FormatException to determine the type of error thrown. In particular, you're assuming that the message is going to be something like:
"The string was not recognized as a valid DateTime. There is a unknown word starting at index 26."
or
"The string was not recognized as a valid DateTime."
and handling the last 'word' in the message; you cannot guarantee what the format of the message will be, and bear in mind that the message will change depending on the locale of the system. In other words, you cannot guarantee that the exception is in English!
I'm fairly certain that this is where your problem lies.
I've re-written your ParseDateTime function so that it doesn't rely on the format of the FormatException message; feel free to use/abuse it!
I hope this helps...
public static DateTime ParseDateTime(s tring dateTime) { System.Globaliz ation.CultureIn fo ci = CultureInfo.Inv ariantCulture;
try { return DateTime.Parse( dateTime, ci, DateTimeStyles. AllowWhiteSpace s); } catch (FormatExceptio n) { try { return DateTime.ParseE xact(dateTime, new string[] {ci.DateTimeFor mat.SortableDat eTimePattern, ci.DateTimeForm at.RFC1123Patte rn}, ci, DateTimeStyles. AllowWhiteSpace s); } catch (FormatExceptio n) { string dateFormat = ci.DateTimeForm at.RFC1123Patte rn.Replace("'GM T'", "zzz"); foreach(string[] entry in TimeZones) { if (dateTime.EndsW ith(entry[0])) { dateTime = String.Format(" {0}{1}", dateTime.Substr ing(0, dateTime.Length - entry[0].Length), entry[1]); break; } } try { return DateTime.ParseE xact(dateTime, dateFormat, ci, DateTimeStyles. AllowWhiteSpace s); } catch (FormatExceptio n) { return DateTime.Now; } } } }
--
Ed Courtenay [MCP, MCSD] http://www.edcourtenay.co.uk This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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by: muto222 |
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How can i add a mobile payment intergratation into php mysql website.
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