详解C# TimeSpan 计算时间差(时间间隔)

TimeSpan ts = new TimeSpan(12, 12, 11, 12, 21);
      int days = new TimeSpan(12, 12, 11, 12, 21).Days;
      TimeSpan duration = new TimeSpan(-12, 12, 11, 12, 21).Duration();//24小时的反值
      double totalDays = new TimeSpan(12, 12, 11, 12, 21).TotalDays;
      double totalHours = new TimeSpan(2, 12, 11, 12, 21).TotalHours;
      int hours = new TimeSpan(12, 12, 11, 12, 21).Hours;
      int minutes = new TimeSpan(12, 12, 11, 12, 21).Minutes;
      TimeSpan ts2 = new TimeSpan(1, 3, 01, 12, 21);
      // TimeSpan ts2 = new TimeSpan(5, 3, 1, 12, 21);//this is also right
      TimeSpan ts3 = new TimeSpan(5, 3, 01, 12, 21).Add(ts);
      TimeSpan ts4 = new TimeSpan(4, 3, 01, 12, 21).Subtract(ts);
      TimeSpan ts5 = new TimeSpan(4, 3, 01, 12, 21).Subtract(ts).Duration();
      TimeSpan Negate = new TimeSpan(5, 3, 01, 12, 21).Negate();
      DateTime dtnow = DateTime.Now;
      Console.WriteLine(ts);
      Console.WriteLine(days);
      Console.WriteLine(duration);
      Console.WriteLine(totalDays);
      Console.WriteLine(totalHours);
      Console.WriteLine(hours);
      Console.WriteLine(minutes);
      Console.WriteLine(ts2);
      Console.WriteLine(ts+ts2);
      Console.WriteLine(ts3);
      Console.WriteLine("Subtract:"+ts4);
      Console.WriteLine("Duration:" + ts5);
      Console.WriteLine(ts - ts2);
      Console.WriteLine(Negate);
      DateTime span = DateTime.Now.Add(ts2);
      TimeSpan spdate = span - DateTime.Now;
      long dateTicks = DateTime.Now.Add(ts2).Ticks;
      Console.WriteLine(span);
      Console.WriteLine(spdate);
      Console.WriteLine(dateTicks);

public string DateStringFromNow(DateTime dt) 
{ 
TimeSpan 
span = DateTime.Now - dt; 
if (span.TotalDays > 60) 
{ 
return 
dt.ToShortDateString(); 
} 
else if ( span.TotalDays > 30 ) 
{ 

return "1个月前"; 
} 
else if (span.TotalDays > 14) 
{ 
return 
"2周前"; 
} 
else if (span.TotalDays > 7) 
{ 
return "1周前"; 
} 

else if (span.TotalDays > 1) 
{ 
return string.Format("{0}天前", 
(int)Math.Floor(span.TotalDays)); 
} 
else if (span.TotalHours > 1) 
{ 
return string.Format("{0}小时前", (int)Math.Floor(span.TotalHours)); 
} 
else if (span.TotalMinutes > 1) 
{ 
return string.Format("{0}分钟前", (int)Math.Floor(span.TotalMinutes)); 
} 
else if (span.TotalSeconds >= 1) 
{ 
return string.Format("{0}秒前", 
(int)Math.Floor(span.TotalSeconds)); 
} 

else { 
return "1秒前"; 

} 
}

private string DateDiff(DateTime DateTime1, DateTime DateTime2)
{string dateDiff = null;
TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
TimeSpan ts2 = new 
TimeSpan(DateTime2.Ticks);
TimeSpan ts = ts1.Subtract(ts2).Duration();
dateDiff = ts.Days.ToString()+"天"+ ts.Hours.ToString()+"小时"+ ts.Minutes.ToString()+"分钟"+ ts.Seconds.ToString()+"秒";
return dateDiff;
}
TimeSpan ts = Date1 - Date2; 
double dDays = ts.TotalDays;//带小数的天数，比如1天12小时结果就是1.5

/// <summary>
/// 日期比较
/// </summary>
/// <param name="today">当前日期</param>
/// <param name="writeDate">输入日期</param>
/// <param name="n">比较天数</param>
<returns>大于天数返回true，小于返回false</returns>
private bool CompareDate(string today, string writeDate, int n)
{
DateTime Today = Convert.ToDateTime(today);
DateTime WriteDate = Convert.ToDateTime(writeDate);
WriteDate = WriteDate.AddDays(n);
if (Today>= WriteDate)
return false;
else
return true;
}