工做年限

 var o入職年 = o入職日期.Value.Year;
            var o入職月 = o入職日期.Value.Month;
            var o入職天 = o入職日期.Value.Day;
            int y = DateTime.Now.Year - o入職日期.Value.Year; //年差
            int m = y * 12 + DateTime.Now.Month - o入職日期.Value.Month;  //月差
            if (DateTime.Now.Day - o入職天 < 0)
            {
                m = m - 1;
            }
            int o工做年限 = m / 12;
            return o工做年限;