asp.net 处理和计算微博发布时间

using System; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Documents; 
using System.Windows.Ink; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Shapes; 
 
namespace MicroBlogForWP7.Classes 
{ 
    public class TimeParser 
    { 
        /// <summary> 
        /// 把秒转换成分钟 
        /// </summary> 
        /// <returns></returns> 
        public static int SecondToMinute(int Second) 
        { 
            decimal mm = (decimal)((decimal)Second / (decimal)60); 
            return Convert.ToInt32(Math.Ceiling(double.Parse(mm.ToString()))); 
        } 
 
        #region 返回某年某月最后一天 
        /// <summary> 
        /// 返回某年某月最后一天 
        /// </summary> 
        /// <param name="year">年份</param> 
        /// <param name="month">月份</param> 
        /// <returns>日</returns> 
        public static int GetMonthLastDate(int year, int month) 
        { 
            DateTime lastDay = new DateTime(year, month, new System.Globalization.GregorianCalendar().GetDaysInMonth(year, month)); 
            int Day = lastDay.Day; 
            return Day; 
        } 
        #endregion 
 
        #region 返回时间差 
        public static string DateDiff(DateTime DateTime1, DateTime DateTime2) 
        { 
            string dateDiff = null; 
            try