ASP.NET常见日期方法荟萃

时间：2007-04-18 来源：toumh

一.如何获得当月有多少天

int m=System.DateTime.DaysInMonth(System.DateTime.Now.Year,System.DateTime.Now.Month);

二.日期型格式处理通用方法
1.在webconfig中配置如下

2.在global.asax中

protected void Application_BeginRequest(Object sender, EventArgs e)
{
    Thread currentThread = Thread.CurrentThread;
    CultureInfo cul = currentThread.CurrentCulture.Clone() as CultureInfo;
    cul.DateTimeFormat.ShortDatePattern= BLLFacade.Common.GetShortDatePattern();
    cul.DateTimeFormat.LongDatePattern= BLLFacade.Common.GetLongDatePattern();
    cul.DateTimeFormat.ShortTimePattern= BLLFacade.Common.GetShortTimePattern();
    cul.DateTimeFormat.LongTimePattern= BLLFacade.Common.GetLongTimePattern();
    currentThread.CurrentCulture = cul;
}

3.在业务逻辑层中

public static string GetShortDatePattern()
{
    return System.Configuration.ConfigurationSettings.AppSettings["ShortDatePattern"];
}

public static string GetLongDatePattern()
{
    return System.Configuration.ConfigurationSettings.AppSettings["LongDatePattern"];
}

public static string GetShortTimePattern()
{
    return System.Configuration.ConfigurationSettings.AppSettings["ShortTimePattern"];
}

public static string GetLongTimePattern()
{
    return System.Configuration.ConfigurationSettings.AppSettings["LongTimePattern"];
}

4.然后在其他地方正常调用就可以了，如果需要修改格式只需要修改webconfig中的，且可以保证整个系统中的所有格式都是一致的..

三.在asp.net中怎么样计算两个日期相差的年、月份、日期、小时、分钟、秒等
在asp.net中怎么样计算两个日期相差的年、月份、日期、小时、分钟、秒等#region 在asp.net中怎么样计算两个日期相差的年、月份、日期、小时、分钟、秒等

//调用
//DateTime a=Convert.ToDateTime("2005-09-03 20:15");
//DateTime b=Convert.ToDateTime("2005-09-04 09:09 ");
//double d=Bll.Common.DateDiff(Bll.Common.EnumDateCompare.day,a,b);
        //Response.Write(d.ToString("f0"));//四舍五入
        public enum EnumDateCompare
        {
            year =1,
            month =2,
            day =3,
            hour =4,
            minute =5,
            second =6
        }
        public static double DateDiff(EnumDateCompare howtocompare, System.DateTime startDate, System.DateTime endDate)
        {
            double diff=0;
            System.TimeSpan TS = new System.TimeSpan(endDate.Ticks-startDate.Ticks);

            switch (howtocompare)
            {
                case EnumDateCompare.year:
                    diff = Convert.ToDouble(TS.TotalDays/365);
                    break;
                case EnumDateCompare.month:
                    diff = Convert.ToDouble((TS.TotalDays/365)*12);
                    break;
                case EnumDateCompare.day:
                    diff = Convert.ToDouble(TS.TotalDays);
                    break;
                case EnumDateCompare.hour:
                    diff = Convert.ToDouble(TS.TotalHours);
                    break;
                case EnumDateCompare.minute:
                    diff = Convert.ToDouble(TS.TotalMinutes);
                    break;
                case EnumDateCompare.second:
                    diff = Convert.ToDouble(TS.TotalSeconds);
                    break;
            }
            return diff;
        }

四.获取某月的实际工作日(即不包括周六日)

//调用
//int days =getDays(System.DateTime.Now));
private int getDays(System.DateTime date1)
{
    int m=System.DateTime.DaysInMonth(date1.Year,date1.Month);
    int mm=0;
    for(int i=1;i<=m;i++)
    {
        System.DateTime date=Convert.ToDateTime(date1.Year+"-"+date1.Month+"-"+i);
        switch (date.DayOfWeek)
        {
            case System.DayOfWeek.Monday:
            case System.DayOfWeek.Thursday:
            case System.DayOfWeek.Tuesday:
            case System.DayOfWeek.Wednesday:
            case System.DayOfWeek.Friday:
                mm=mm+1;
                break;

        }
    }
    return mm;
}

五.获得任意两日期之间的有效工作日(不包括周六日) 获得任意两日期之间的有效工作日(不包括周六日)

//调用
//DateTime date1=Convert.ToDateTime("2005-10-20");
//DateTime date2=Convert.ToDateTime("2005-11-01");
//int days =getDays(date1,date2);
private int getDays(System.DateTime date1,System.DateTime date2)
{
      string m=DateDiff(EnumDateCompare.day,date1,date2).ToString("f0");
      int mm=0;
      for(int i=0;i<=Convert.ToInt32(m);i++)
      {
           System.DateTime date=Convert.ToDateTime(date1.AddDays(i));
           switch (date.DayOfWeek)
           {
               case System.DayOfWeek.Monday:
               case System.DayOfWeek.Thursday:
               case System.DayOfWeek.Tuesday:
               case System.DayOfWeek.Wednesday:
               case System.DayOfWeek.Friday:
                    mm=mm+1;
                    break;
           }
      }
      return mm;
}