private string[] dateFormat = { "dd/MM/yyyy", "d/M/yyyy", "dd/MM/yyyy HH:mm:ss", "dd/MM/yyyy HH:m:s" };
DateTime.ParseExact(sStartDate,dateFormat,DateTimeFormatInfo.InvariantInfo,DateTimeStyles.AllowWhiteSpaces);
原文：http://www.cnblogs.com/kkwoo/p/4013424.html