/// <summary>
        /// 将对象转换为日期时间类型
        /// </summary>
        /// <param name="obj">要转换的对象</param>
        /// <param name="defValue">缺省值</param>
        /// <returns></returns>
        public static DateTime ToDateTime(object obj, DateTime defValue)
        {
            if (CheckData.IsObjectNull(obj))
            {
                return(defValue);
            }
            if (CheckData.IsTypeEqual(obj.GetType(), typeof(DateTime)))
            {
                return((DateTime)obj);
            }
            string s = obj.ToString();

            if (CheckData.IsStringNull(s))
            {
                return(defValue);
            }
            DateTime time;

            return(DateTime.TryParse(s, out time) ? time : defValue);
        }