asp.Netマイクロブログの公開時間の処理と計算

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>
        ///        
        /// </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           
        /// <summary>
        ///           
        /// </summary>
        /// <param name="year">  </param>
        /// <param name="month">  </param>
        /// <returns> </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      
        public static string DateDiff(DateTime DateTime1, DateTime DateTime2)
        {
            string dateDiff = null;
            try
            {
                //TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
                //TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
                //TimeSpan ts = ts1.Subtract(ts2).Duration();
                TimeSpan ts = DateTime2 - DateTime1;
                if (ts.Days >= 1)
                {
                    dateDiff = DateTime1.Month.ToString() + " " + DateTime1.Day.ToString() + " ";
                }
                else
                {
                    if (ts.Hours > 1)
                    {
                        dateDiff = ts.Hours.ToString() + "   ";
                    }
                    else
                    {
                        dateDiff = ts.Minutes.ToString() + "   ";
                    }
                }
            }
            catch
            { }
            return dateDiff;
        }
        #endregion

        #region             
        /// <summary>
        ///             
        /// </summary>
        /// <param name="year">     </param>
        /// <param name="month">    </param>
        public static string GetWhenSendTime(DateTime BlogTime, DateTime NowTime)
        {
            DateTime t1 = BlogTime;
            DateTime t2 = NowTime;
            string RES = "";
            if ((t2 - t1).TotalMinutes > 1440)
            {
                RES = t1.ToString("yyyy MM dd  HH:mm");
            }
            else
                if ((t2 - t1).TotalMinutes > 60)
                {
                    RES = Math.Floor(((t2 - t1).TotalMinutes / 60)).ToString() + "  " + (Math.Floor((t2 - t1).TotalMinutes) % 60).ToString() + "   ";
                }
                else
                {
                    if ((Math.Floor((t2 - t1).TotalMinutes) % 60) <= 0) RES = "    ";
                    else
                        RES = (Math.Floor((t2 - t1).TotalMinutes) % 60).ToString() + "   ";
                }
            return RES;
        }
        #endregion
    }
}