public static bool TryParseRfc822DateTime(string value, out DateTime result)
{
//------------------------------------------------------------
// Local members
//------------------------------------------------------------
DateTimeFormatInfo dateTimeFormat = CultureInfo.InvariantCulture.DateTimeFormat;
string[] formats = new string[3];
//------------------------------------------------------------
// Define valid RFC-822 formats
//------------------------------------------------------------
formats[0] = dateTimeFormat.RFC1123Pattern;
formats[1] = "ddd',' d MMM yyyy HH:mm:ss zzz";
formats[2] = "ddd',' dd MMM yyyy HH:mm:ss zzz";
//------------------------------------------------------------
// Validate parameter
//------------------------------------------------------------
if (String.IsNullOrEmpty(value))
{
result = DateTime.MinValue;
return(false);
}
//------------------------------------------------------------
// Perform conversion of RFC-822 formatted date-time string
//------------------------------------------------------------
return(DateTime.TryParseExact(SyndicationDateTimeUtility.ReplaceRfc822TimeZoneWithOffset(value), formats, dateTimeFormat, DateTimeStyles.None, out result));
}
public static bool TryParseRfc822DateTime(string value, out DateTime result)
{
// patterns from http://stackoverflow.com/questions/284775/how-do-i-parse-and-convert-datetimes-to-the-rfc-822-date-time-format
DateTimeFormatInfo dateTimeFormat = CultureInfo.InvariantCulture.DateTimeFormat;
string[] formats = new string[36];
// two-digit day, four-digit year patterns
formats[0] = "ddd',' dd MMM yyyy HH':'mm':'ss'.'fffffff zzzz";
formats[1] = "ddd',' dd MMM yyyy HH':'mm':'ss'.'ffffff zzzz";
formats[2] = "ddd',' dd MMM yyyy HH':'mm':'ss'.'fffff zzzz";
formats[3] = "ddd',' dd MMM yyyy HH':'mm':'ss'.'ffff zzzz";
formats[4] = "ddd',' dd MMM yyyy HH':'mm':'ss'.'fff zzzz";
formats[5] = "ddd',' dd MMM yyyy HH':'mm':'ss'.'ff zzzz";
formats[6] = "ddd',' dd MMM yyyy HH':'mm':'ss'.'f zzzz";
formats[7] = "ddd',' dd MMM yyyy HH':'mm':'ss zzzz";
// two-digit day, two-digit year patterns
formats[8] = "ddd',' dd MMM yy HH':'mm':'ss'.'fffffff zzzz";
formats[9] = "ddd',' dd MMM yy HH':'mm':'ss'.'ffffff zzzz";
formats[10] = "ddd',' dd MMM yy HH':'mm':'ss'.'fffff zzzz";
formats[11] = "ddd',' dd MMM yy HH':'mm':'ss'.'ffff zzzz";
formats[12] = "ddd',' dd MMM yy HH':'mm':'ss'.'fff zzzz";
formats[13] = "ddd',' dd MMM yy HH':'mm':'ss'.'ff zzzz";
formats[14] = "ddd',' dd MMM yy HH':'mm':'ss'.'f zzzz";
formats[15] = "ddd',' dd MMM yy HH':'mm':'ss zzzz";
// one-digit day, four-digit year patterns
formats[16] = "ddd',' d MMM yyyy HH':'mm':'ss'.'fffffff zzzz";
formats[17] = "ddd',' d MMM yyyy HH':'mm':'ss'.'ffffff zzzz";
formats[18] = "ddd',' d MMM yyyy HH':'mm':'ss'.'fffff zzzz";
formats[19] = "ddd',' d MMM yyyy HH':'mm':'ss'.'ffff zzzz";
formats[20] = "ddd',' d MMM yyyy HH':'mm':'ss'.'fff zzzz";
formats[21] = "ddd',' d MMM yyyy HH':'mm':'ss'.'ff zzzz";
formats[22] = "ddd',' d MMM yyyy HH':'mm':'ss'.'f zzzz";
formats[23] = "ddd',' d MMM yyyy HH':'mm':'ss zzzz";
// two-digit day, two-digit year patterns
formats[24] = "ddd',' d MMM yy HH':'mm':'ss'.'fffffff zzzz";
formats[25] = "ddd',' d MMM yy HH':'mm':'ss'.'ffffff zzzz";
formats[26] = "ddd',' d MMM yy HH':'mm':'ss'.'fffff zzzz";
formats[27] = "ddd',' d MMM yy HH':'mm':'ss'.'ffff zzzz";
formats[28] = "ddd',' d MMM yy HH':'mm':'ss'.'fff zzzz";
formats[29] = "ddd',' d MMM yy HH':'mm':'ss'.'ff zzzz";
formats[30] = "ddd',' d MMM yy HH':'mm':'ss'.'f zzzz";
formats[31] = "ddd',' d MMM yy HH':'mm':'ss zzzz";
// Fall back patterns
formats[32] = "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffffffK"; // RoundtripDateTimePattern
formats[33] = DateTimeFormatInfo.InvariantInfo.UniversalSortableDateTimePattern;
formats[34] = DateTimeFormatInfo.InvariantInfo.SortableDateTimePattern;
formats[35] = dateTimeFormat.RFC1123Pattern;
if (String.IsNullOrEmpty(value))
{
result = DateTime.MinValue;
return(false);
}
if (DateTime.TryParseExact(SyndicationDateTimeUtility.ReplaceRfc822TimeZoneWithOffset(value), formats, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.AdjustToUniversal, out result))
{
return(true);
}
if (DateTime.TryParse(SyndicationDateTimeUtility.ReplaceRfc822TimeZoneWithOffset(value), out result))
{
return(true);
}
return(false);
}