将月份名称为C#DateTime的日期解析为

DateTime.ParseExact .

DateTime.ParseExact(dateString, "dd MMM yyyy H:mm:ss \\G\\M\\Tzzz", System.Globalization.CultureInfo.InvariantCulture);

如以下评论所示, System.Globalization.CultureInfo.CurrentCulture

public static DateTime ParseDate(string value)
{
    DateTime date = new DateTime();
    if (value.Length <= 7) // 1.1.98, 21.3.98, 1.12.98, 
        DateTime.TryParseExact(value, "d.M.yy", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.AssumeLocal, out date);
    else if (value.Length == 8 && value[5] == '.') // 21.01.98
        DateTime.TryParseExact(value, "dd.MM.yy", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.AssumeLocal, out date);
    else if (value.Length <= 9) // 1.1.1998, 21.1.1998, 1.12.1998
        DateTime.TryParseExact(value, "d.M.yyyy", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.AssumeLocal, out date);
    else if (value.Length == 10) // 21.01.1998
        DateTime.TryParseExact(value, "dd.MM.yyyy", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.AssumeLocal, out date);
    return date;
}

public static DateTime? ExtractDate(string text)
{
    DateTime? ret = null;
    Regex regex = new Regex(@"\d{1,2}\.\d{1,2}\.\d{2,4}");
    MatchCollection matches = regex.Matches(text);
    foreach (Match match in matches)
    {
        DateTime date = ParseDate(match.Value);
        if (ret == null || ret < date)
            ret = date;
    }
    return ret;
}