c#友好显示日期 c#日期datetime使用方法

#region 友好显示时间
        /// <summary>
        /// 友好显示时间
        /// </summary>
        /// <param name="date"></param>
        /// <returns></returns>
        public static string ShowTime(DateTime date)
        {
            const int SECOND = 1;
            const int MINUTE = 60 * SECOND;
            const int HOUR = 60 * MINUTE;
            const int DAY = 24 * HOUR;
            const int MONTH = 30 * DAY;
            TimeSpan ts = DateTime.Now - date;
            double delta = ts.TotalSeconds;
            if (delta < 0)
            {
                return "not yet";
            }
            if (delta < 1 * MINUTE)
            {
                return ts.Seconds == 1 ? "1秒前" : ts.Seconds + "秒前";
            }
            if (delta < 2 * MINUTE)
            {
                return "1分钟之前";
            }
            if (delta < 45 * MINUTE)
            {
                return ts.Minutes + "分钟";
            }
            if (delta < 90 * MINUTE)
            {
                return "1小时前";
            }
            if (delta < 24 * HOUR)
            {
                return ts.Hours + "小时前";
            }
            if (delta < 48 * HOUR)
            {
                return "昨天";
            }
            if (delta < 30 * DAY)
            {
                return ts.Days + " 天之前";
            }
            if (delta < 12 * MONTH)
            {
                int months = Convert.ToInt32(Math.Floor((double)ts.Days / 30));
                return months <= 1 ? "一个月之前" : months + "月之前";
            }
            else
            {
                int years = Convert.ToInt32(Math.Floor((double)ts.Days / 365));
                return years <= 1 ? "一年前" : years + "年前";
            }
        }
        #endregion