C#时间操作类分享

using System;

namespace DotNet.Utilities
{
 /// <summary>
 /// 时间类
 /// 1、SecondToMinute(int Second) 把秒转换成分钟
 /// </summary>
 public class TimeHelper
 {
  /// <summary>
  /// 将时间格式化成 年月日 的形式,如果时间为null，返回当前系统时间
  /// </summary>
  /// <param name="dt">年月日分隔符</param>
  /// <param name="Separator"></param>
  /// <returns></returns>
  public string GetFormatDate(DateTime dt, char Separator)
  {
   if (dt != null && !dt.Equals(DBNull.Value))
   {
    string tem = string.Format("yyyy{0}MM{1}dd", Separator, Separator);
    return dt.ToString(tem);
   }
   else
   {
    return GetFormatDate(DateTime.Now, Separator);
   }
  }
  /// <summary>
  /// 将时间格式化成 时分秒 的形式,如果时间为null，返回当前系统时间
  /// </summary>
  /// <param name="dt"></param>
  /// <param name="Separator"></param>
  /// <returns></returns>
  public string GetFormatTime(DateTime dt, char Separator) {
   if (dt != null && !dt.Equals(DBNull.Value))
   {
    string tem = string.Format("hh{0}mm{1}ss", Separator, Separator);
    return dt.ToString(tem);
   }
   else
   {
    return GetFormatDate(DateTime.Now, Separator);
   }
  }
  /// <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(mm));
  }

  #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
   {
    //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() + "月" + DateTime1.Day.ToString() + "日";
    }
    else
    {
     if (ts.Hours > 1)
     {
      dateDiff = ts.Hours.ToString() + "小时前";
     }
     else
     {
      dateDiff = ts.Minutes.ToString() + "分钟前";
     }
    }
   }
   catch
   { }
   return dateDiff;
  }
  #endregion

  #region 获得两个日期的间隔
  /// <summary>
  /// 获得两个日期的间隔
  /// </summary>
  /// <param name="DateTime1">日期一。</param>
  /// <param name="DateTime2">日期二。</param>
  /// <returns>日期间隔TimeSpan。</returns>
  public static TimeSpan DateDiff2(DateTime DateTime1, DateTime DateTime2)
  {
   TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
   TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
   TimeSpan ts = ts1.Subtract(ts2).Duration();
   return ts;
  }
  #endregion

  #region 格式化日期时间
  /// <summary>
  /// 格式化日期时间
  /// </summary>
  /// <param name="dateTime1">日期时间</param>
  /// <param name="dateMode">显示模式</param>
  /// <returns>0-9种模式的日期</returns>
  public static string FormatDate(DateTime dateTime1, string dateMode)
  {
   switch (dateMode)
   {
    case "0":
     return dateTime1.ToString("yyyy-MM-dd");
    case "1":
     return dateTime1.ToString("yyyy-MM-dd HH:mm:ss");
    case "2":
     return dateTime1.ToString("yyyy/MM/dd");
    case "3":
     return dateTime1.ToString("yyyy年MM月dd日");
    case "4":
     return dateTime1.ToString("MM-dd");
    case "5":
     return dateTime1.ToString("MM/dd");
    case "6":
     return dateTime1.ToString("MM月dd日");
    case "7":
     return dateTime1.ToString("yyyy-MM");
    case "8":
     return dateTime1.ToString("yyyy/MM");
    case "9":
     return dateTime1.ToString("yyyy年MM月");
    default:
     return dateTime1.ToString();
   }
  }
  #endregion

  #region 得到随机日期
  /// <summary>
  /// 得到随机日期
  /// </summary>
  /// <param name="time1">起始日期</param>
  /// <param name="time2">结束日期</param>
  /// <returns>间隔日期之间的 随机日期</returns>
  public static DateTime GetRandomTime(DateTime time1, DateTime time2)
  {
   Random random = new Random();
   DateTime minTime = new DateTime();
   DateTime maxTime = new DateTime();

   System.TimeSpan ts = new System.TimeSpan(time1.Ticks - time2.Ticks);

   // 获取两个时间相隔的秒数
   double dTotalSecontds = ts.TotalSeconds;
   int iTotalSecontds = 0;

   if (dTotalSecontds > System.Int32.MaxValue)
   {
    iTotalSecontds = System.Int32.MaxValue;
   }
   else if (dTotalSecontds < System.Int32.MinValue)
   {
    iTotalSecontds = System.Int32.MinValue;
   }
   else
   {
    iTotalSecontds = (int)dTotalSecontds;
   }


   if (iTotalSecontds > 0)
   {
    minTime = time2;
    maxTime = time1;
   }
   else if (iTotalSecontds < 0)
   {
    minTime = time1;
    maxTime = time2;
   }
   else
   {
    return time1;
   }

   int maxValue = iTotalSecontds;

   if (iTotalSecontds <= System.Int32.MinValue)
    maxValue = System.Int32.MinValue + 1;

   int i = random.Next(System.Math.Abs(maxValue));

   return minTime.AddSeconds(i);
  }
  #endregion
 }
}