dateutil.cs

专业的办公oa代码下载 c#语言编写 三层结构

using System;

namespace qminoa.Common
{
	/// <summary>
	/// 日期处理函数包
	/// </summary>
	public class DateUtil
	{
		//构造函数
		public DateUtil()
		{

		}
		

    #region 方法

		/// <summary>返回本年有多少天</summary>
		/// <param name="iYear">年份</param>
		/// <returns>本年的天数</returns>
		public static int GetDaysOfYear(int iYear)
		{
			int cnt = 0  ;
			if (  IsRuYear(iYear) ) 
			{
				//闰年多 1 天 即：2 月为 29 天
			    cnt = 366;
				
			}
			else
			{
		       //--非闰年少1天 即：2 月为 28 天
			   cnt = 365;
			}
			return cnt;
		}


		/// <summary>本年有多少天</summary>
		/// <param name="dt">日期</param>
		/// <returns>本天在当年的天数</returns>
		public static int GetDaysOfYear(DateTime idt)
		{
			int n ;
			
			//取得传入参数的年份部分，用来判断是否是闰年
			
			n = idt.Year;
			if (  IsRuYear(n) ) 
			{
				//闰年多 1 天 即：2 月为 29 天
				return 366; 
			}
			else
			{
				//--非闰年少1天 即：2 月为 28 天
				return 365;
			}

		}


		/// <summary>本月有多少天</summary>
		/// <param name="iYear">年</param>
		/// <param name="Month">月</param>
		/// <returns>天数</returns>
		public static int GetDaysOfMonth(int iYear,int Month)
		{
		   int days=0;
			switch (Month)
			{
				case 1:
					days = 31;
					break;
				case 2:
					if (  IsRuYear(iYear) ) 
					{
						//闰年多 1 天 即：2 月为 29 天
						days = 29;
					}
					else
					{
						//--非闰年少1天 即：2 月为 28 天
						days = 28;
					}

					break;
				case 3:
					days = 31;
					break;
				case 4:
					days = 30;
					break;
				case 5:
					days = 31;
					break;
				case 6:
					days = 30;
					break;
				case 7:
					days = 31;
					break;
				case 8:
					days = 31;
					break;
				case 9:
					days = 30;
					break;
				case 10:
					days = 31;
					break;
				case 11:
					days = 30;
					break;
				case 12:
					days = 31;
					break;
			}	   

			return days ;


		}

		
		/// <summary>本月有多少天</summary>
		/// <param name="dt">日期</param>
		/// <returns>天数</returns>
		public static int GetDaysOfMonth(DateTime dt)
		{
			//--------------------------------//
			//--从dt中取得当前的年，月信息  --//
			//--------------------------------//
			int year,month,days=0;
			year = dt.Year ;
			month = dt.Month ;

			//--利用年月信息，得到当前月的天数信息。
			switch (month)
			{
				case 1:
					days = 31;
					break;
				case 2:
					if (  IsRuYear(year) ) 
					{
						//闰年多 1 天 即：2 月为 29 天
						days = 29;
					}
					else
					{
						//--非闰年少1天 即：2 月为 28 天
						days = 28;
					}

					break;
				case 3:
					days = 31;
					break;
				case 4:
					days = 30;
					break;
				case 5:
					days = 31;
					break;
				case 6:
					days = 30;
					break;
				case 7:
					days = 31;
					break;
				case 8:
					days = 31;
					break;
				case 9:
					days = 30;
					break;
				case 10:
					days = 31;
					break;
				case 11:
					days = 30;
					break;
				case 12:
					days = 31;
					break;
			}	   

			return days ;

		}

		
		/// <summary>返回当前日期的星期名称</summary>
		/// <param name="dt">日期</param>
		/// <returns>星期名称</returns>
		public static string GetWeekNameOfDay(DateTime idt)
		{ 
			string dt ,week="";

			dt = idt.DayOfWeek.ToString();
			switch  (dt)
			{
				case "Mondy":
					week= "星期一";
					break;
				case "Tuesday" :
					week= "星期二";
					break;
				case "Wednesday":
					week= "星期三";
					break;
				case "Thursday" :
					week= "星期四";
					break;
				case "Friday" :
					week= "星期五";
					break;
				case "Saturday":
					week= "星期六";
					break;
				case "Sunday":
					week = "星期日";
					break;

			}
			return week;
		}
						
		
		/// <summary>返回当前日期的星期编号</summary>
		/// <param name="dt">日期</param>
		/// <returns>星期数字编号</returns>
		public static string GetWeekNumberOfDay(DateTime idt)
		{ 
				string dt,week="";

				dt = idt.DayOfWeek.ToString();
				switch  (dt)
				{
					case "Mondy":
						week= "1";
						break;
					case "Tuesday" :
						week= "2";
						break;
					case "Wednesday":
						week= "3";
						break;
					case "Thursday" :
						week= "4";
						break;
					case "Friday" :
						week= "5";
						break;
					case "Saturday":
						week= "6";
						break;
					case "Sunday":
						week = "7";
						break;

				}	   
			
			return week;


		}


		/// <summary>返回两个日期之间相差的天数</summary>
		/// <param name="dt">两个日期参数</param>
		/// <returns>天数</returns>
		public static int DiffDays(DateTime dtfrm,DateTime dtto)
		{ 
			int diffcnt=0;
			//diffcnt = dtto- dtfrm ;
			
			return diffcnt;
		}

		
		/// <summary>判断当前日期所属的年份是否是闰年，私有函数</summary>
		/// <param name="dt">日期</param>
		/// <returns>是闰年：True ，不是闰年：False</returns>
		private static bool IsRuYear(DateTime idt)
		{
			//形式参数为日期类型 
			//例如：2003-12-12
			int n ;
			n = idt.Year;

			if (  (n % 400  == 0)  ||   (n %  4 == 0 && n % 100  != 0)  ) 
			{
				return true;
			}
			else
			{
				return false;
			}
		}

		
		/// <summary>判断当前年份是否是闰年，私有函数</summary>
		/// <param name="dt">年份</param>
		/// <returns>是闰年：True ，不是闰年：False</returns>
		private static bool IsRuYear(int iYear)
		{
			//形式参数为年份
			//例如：2003
			int n ;
			n = iYear;

			if  (   (  n % 400 == 0)  ||   (n % 4 == 0 && n % 100  != 0)  ) 
			{
				return true;
			}
			else
			{
				return false;
			}
		}


		/// <summary>
		/// 将输入的字符串转化为日期。如果字符串的格式非法，则返回当前日期。
		/// </summary>
		/// <param name="strInput">输入字符串</param>
		/// <returns>日期对象</returns>
		public static DateTime ConvertStringToDate(string strInput)
		{
			DateTime oDateTime;

			try
			{
				oDateTime=DateTime.Parse(strInput);       
			}
			catch(Exception)
			{
				oDateTime=DateTime.Today;  
			}

			return oDateTime;
		}


		/// <summary>
		/// 将日期对象转化为格式字符串
		/// </summary>
		/// <param name="oDateTime">日期对象</param>
		/// <param name="strFormat">
		/// 格式：
		///		"SHORTDATE"===短日期
		///		"LONGDATE"==长日期
		///		其它====自定义格式
		/// </param>
		/// <returns>日期字符串</returns>
		public static string ConvertDateToString(DateTime oDateTime,string strFormat)
		{
			string strDate="";

			try
			{
				switch(strFormat.ToUpper())
				{
					case "SHORTDATE":
						strDate=oDateTime.ToShortDateString();
						break;
					case "LONGDATE":
						strDate=oDateTime.ToLongDateString() ;
						break;
					default:
						strDate=oDateTime.ToString(strFormat) ;
						break;
				}
			}
			catch(Exception)
			{
				strDate=oDateTime.ToShortDateString();
			}

			return strDate;
		}



		/// <summary>
		/// 判断是否为合法日期，必须大于1800年1月1日
		/// </summary>
		/// <param name="strDate">输入日期字符串</param>
		/// <returns>True/False</returns>
		public static bool IsDateTime(string strDate)
		{
			try
			{
				DateTime oDate=DateTime.Parse(strDate); 
				if(oDate.CompareTo(DateTime.Parse("1800-1-1") )>0)
					return true;
				else
					return false;
			}
			catch(Exception)
			{
				return false;
			}
		}

		#endregion


	}
}