如何将Paypal的HH:MM:SS DD Mmm(.)YYYY PST/PDT转换为C#UTC DateTime？

Question

我想在SQL Server数据库中以这种格式记录payment_date.

更新.本能是正确的.在这里找到了一个解决方案:http://www.codeillustrator.com/2010/03/converting-paypal-paymentdate-to-net.html,验证......当然,如果Paypal移出西海岸,我'会遇到麻烦.有没有更好的解析方法？也许与TimeZone？

public static DateTime ConvertPayPalDateTime(string payPalDateTime)
{
    // accept a few different date formats because of PST/PDT timezone and slight month difference in sandbox vs. prod.
    string[] dateFormats = { "HH:mm:ss MMM dd, yyyy PST", "HH:mm:ss MMM. dd, yyyy PST", "HH:mm:ss MMM dd, yyyy PDT", "HH:mm:ss MMM. dd, yyyy PDT" };
    DateTime outputDateTime;

    DateTime.TryParseExact(payPalDateTime, dateFormats, new CultureInfo("en-US"), DateTimeStyles.None, out outputDateTime);

    // convert to local timezone
    outputDateTime = outputDateTime.AddHours(3);

    return outputDateTime;
}

等一下,上面的代码对我来说是完全错误的.我在西海岸!理想情况下,应更新此日期以将日期发送到正确的UTC DateTime并处理任何时区.此外,上面的代码不能正确处理PDT(如果转换为UTC).

UPDATE2.显然,至少在以前的版本中,沙箱将返回"2月".而现场回归"二月".大声笑.有人救了我!

UPDATE3.链接到正则表达式版本http://www.ifinity.com.au/Blog/EntryId/77/Converting-PayPal-Dates-to-Net-DateTime-using-Regex,但调试可能是一个问题.正则表达式似乎不是正确的方法.肯定有更好的办法.

/// <summary>
/// Converts a PayPal datestring into a valid .net datetime value
/// </summary>
/// <param name="dateValue">a string containing a PayPal date</param>
/// <param name="localUtcOffset">the number of hours from UTC/GMT the local 
/// time is (ie, the timezone where the computer is)</param>
/// <returns>Valid DateTime value if successful, DateTime.MinDate if not</returns>
private static DateTime ConvertFromPayPalDate(string rawPayPalDate, int localUtcOffset)
{
    /* regex pattern splits paypal date into
     * time : hh:mm:ss
     * date : Mmm dd yyyy
     * timezone : PST/PDT
     */
     const string payPalDateRegex = @"(?<time>\d{1,2}:\d{2}:\d{2})\s(?<date>(?<
Mmm>[A-Za-z\.]{3,5})\s(?<dd>\d{1,2}),?\s(?<yyyy>\d{4}))\s(?<tz>[A-Z]{0,3})";  
    //!important : above line broken over two lines for formatting - rejoin in code editor
    //example 05:49:56 Oct. 18, 2009 PDT
    //        20:48:22 Dec 25, 2009 PST
    Match dateMatch = Regex.Match(rawPayPalDate, payPalDateRegex, RegexOptions.IgnoreCase);
    DateTime time, date = DateTime.MinValue;
    //check to see if the regex pattern matched the supplied string
    if (dateMatch.Success)
    {
        //extract the relevant parts of the date from regex match groups
        string rawDate = dateMatch.Groups["date"].Value;
        string rawTime = dateMatch.Groups["time"].Value;
        string tz = dateMatch.Groups["tz"].Value;

        //create date and time values
        if (DateTime.TryParse(rawTime, out time) && DateTime.TryParse(rawDate, out date))
        {
            //add the time to the date value to get the datetime value
            date = date.Add(new TimeSpan(time.Hour, time.Minute, time.Second));
            //adjust for the pdt timezone.  Pass 0 to localUtcOffset to get UTC/GMT
            int offset = localUtcOffset + 7; //pdt = utc-7, pst = utc-8
            if (tz == "PDT")//pacific daylight time
                date = date.AddHours(offset);
            else  //pacific standard time
                date = date.AddHours(offset + 1);
        }
    }
    return date;
}

Answer 1

我从2006年开始没有做任何C#,所以这段代码可能无法编译.在飞行前测试它!

public static DateTime ConvertPayPalDateTime(string payPalDateTime)
{
  // Get the offset.
  // If C# supports switching on strings, it's probably more sensible to do that.
  int offset;
  if (payPalDateTime.EndsWith(" PDT"))
  {
     offset = 7;
  }
  else if (payPalDateTime.EndsWith(" PST"))
  {
     offset = 8;
  }
  else
  {
    throw some exception;
  }

  // We've "parsed" the time zone, so remove it from the string.
  payPalDatetime = payPalDateTime.Substring(0,payPalDateTime.Length-4);

  // Same formats as above, but with PST/PDT removed.
  string[] dateFormats = { "HH:mm:ss MMM dd, yyyy", "HH:mm:ss MMM. dd, yyyy" };

  // Parse the date. Throw an exception if it fails.
  DateTime ret = DateTime.ParseExact(payPalDateTime, dateFormats, new CultureInfo("en-US"), DateTimeStyles.None, out outputDateTime);

  // Add the offset, and make it a universal time.
  return ret.AddHours(offset).SpecifyKind(DateTimeKind.Universal);
}