Asp.net time base class operations (short date, long date, time difference)

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

EC namespace
{
    /// <Summary>
    /// function operation time
    /// </ Summary>
    public class TimeObject
    {
        /// <Summary>
        /// time difference
        /// </ Summary>
        /// <param name = "starttime"> start time </ param>
        /// <param name = "the endtime"> end time </ param>
        /// <Returns> </ Returns>
        public static String the GetTimeSpan (the DateTime startTime, the DateTime the endtime)
        {
            the TimeSpan the endtime = TS - startTime;
            return string.Format ( "{1} {0} when {2} second sub {3} ms", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds);
        }

        /// <summary>
        /// 转称为月-日:09-12
        /// </summary>
        /// <param name="d">日期</param>
        /// <returns></returns>
        public static string ToDateMonthDay(DateTime d)
        {
            return d.ToString("MM-dd");
        }
        /// <summary>
        /// 转换为年月日:2006-09-12
        /// </summary>
        /// <param name="d"></param>
        /// <returns></returns>
        public static string ToDateString(DateTime d)
        {
            return d.ToString("yyyy-MM-dd");
        }
        /// <summary>        /// </ Summary>
        /// converted to: hours: minutes: seconds 00:29:58

        /// <param name="t"></param>
        /// <returns></returns>
        public static string ToTimeString(DateTime t)
        {
            return t.ToString("HH:mm:ss");
        }
        /// <summary>
        /// 转换为长时间:2006-09-12 00:30:57
        /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static string ToDateTimeString(DateTime dt)
        {
            return dt.ToString("yyyy-MM-dd HH:mm:ss");
        }    

   
    }

}

Reproduced in: https: //www.cnblogs.com/zhangchenliang/archive/2007/05/05/736660.html