Parse PDF creation and modified date

[Sicos1977]

For everyone who is wondering how you need to parse these dates to a DateTime value.

#region CreateDateTime
/// <summary>
///     Parses the string to a datetime value or null
/// </summary>
/// <param name="dateTimeString"></param>
/// <returns></returns>
private static DateTime? CreateDateTime(string dateTimeString)
{
    try
    {
        if (dateTimeString.StartsWith("D:"))
            dateTimeString = dateTimeString.Substring(2);

        var month = 1;
        var day = 1;
        var hour = 0;
        var minute = 0;
        var second = 0;
        int offsetHour = 0, offsetMinute = 0;

        var year = int.Parse(dateTimeString.Substring(0, 4));

        if (dateTimeString.Length >= 6)
        {
            month = int.Parse(dateTimeString.Substring(4, 2));
            if (dateTimeString.Length >= 8)
            {
                day = int.Parse(dateTimeString.Substring(6, 2));
                if (dateTimeString.Length >= 10)
                {
                    hour = int.Parse(dateTimeString.Substring(8, 2));
                    if (dateTimeString.Length >= 12)
                    {
                        minute = int.Parse(dateTimeString.Substring(10, 2));
                        if (dateTimeString.Length >= 14)
                            second = int.Parse(dateTimeString.Substring(12, 2));
                    }
                }
            }
        }

        var dateTime = new DateTime(year, month, day, hour, minute, second);

        if (dateTimeString.Length <= 14)
            return dateTime;

        var variation = dateTimeString[14];

        if (variation == 'Z')
            return dateTime.ToLocalTime();

        if (dateTimeString.Length >= 17)
        {
            offsetHour = int.Parse(dateTimeString.Substring(15, 2));
            if (dateTimeString.Length >= 20)
                offsetMinute = int.Parse(dateTimeString.Substring(18, 2));
        }

        var timeSpan = new TimeSpan(offsetHour, offsetMinute, 0);
        if (variation == '-')
            dateTime += timeSpan;
        else
            dateTime -= timeSpan;

        return dateTime.ToLocalTime();
    }
    catch (Exception exception)
    {
        return null;
    }
}
#endregion

[BobLd]

@Sicos1977 thanks a lot for that. PdfPig already has UglyToad.PdfPig.Util.DateFormatHelper.TryParseDateTimeOffset(...) - it might be worth merging your efforts with what's available?