C#时间操作类分享

本文实例为大家分享了c#时间操作类的具体代码，供大家参考，具体内容如下

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
 }
}

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