Mega Code Archive
Parse Rfc 2822 Date
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using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Globalization;
using System.Diagnostics;
namespace Opo.Net.Mime
{
public static class MimeUtilities
{
public static DateTime ParseRfc2822Date(string date)
{
date = date.Replace("bst", "+0100");
date = date.Replace("gmt", "-0000");
date = date.Replace("edt", "-0400");
date = date.Replace("est", "-0500");
date = date.Replace("cdt", "-0500");
date = date.Replace("cst", "-0600");
date = date.Replace("mdt", "-0600");
date = date.Replace("mst", "-0700");
date = date.Replace("pdt", "-0700");
date = date.Replace("pst", "-0800");
DateTime parsedDateTime = DateTime.MinValue;
Regex r = new Regex(@"(?:(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun), )?(?<DateTime>\d{1,2} (?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec) \d{4} \d{2}\:\d{2}(?:\:\d{2})?)(?: (?<TimeZone>[\+-]\d{4}))?", RegexOptions.IgnoreCase);
Match m = r.Match(date);
if (m.Success)
{
string dateTime = m.Groups["DateTime"].Value.TrimStart('0');
parsedDateTime = DateTime.ParseExact(dateTime, new string[] { "d MMM yyyy HH:mm", "d MMM yyyy HH:mm:ss", "d MMM yyyy hh:mm", "d MMM yyyy hh:mm:ss" }, CultureInfo.InvariantCulture, DateTimeStyles.None);
string timeZone = m.Groups["TimeZone"].Value;
if (timeZone.Length == 5)
{
int hour = Int32.Parse(timeZone.Substring(0, 3));
int minute = Int32.Parse(timeZone.Substring(3));
TimeSpan offset = new TimeSpan(hour, minute, 0);
parsedDateTime = new DateTimeOffset(parsedDateTime, offset).UtcDateTime;
}
}
return parsedDateTime;
}
public static string ToRfc2822Date(this DateTime date)
{
//TODO: Implement conversion to RFC2822 Date (offset)
TimeSpan offset = TimeZoneInfo.Local.BaseUtcOffset;
Debug.WriteLine(offset.ToString());
//DateTimeOffset dateTimeOffset = new DateTimeOffset(date, offset);
return date.ToString("ddd, dd MMM yyyy HH:mm:ss +") + offset.Hours.ToString().PadRight('0') + "00";
}
}
}
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