C# 日期格式通用转换
DateTime dt = DateTime.ParseExact (DateTime.Now.ToString(yyyyMMddHHmmss"), "yyyyMMddHHmmss", System.Globalization.CultureInfo.CurrentCulture);
DateTime dt = DateTime.ParseExact (DateTime.Now.ToString(yyyyMMddHHmmss"), "yyyyMMddHHmmss", System.Globalization.CultureInfo.CurrentCulture);