鴨爸的隨手寫寫

日期的計算跟顯示我想可能在所有的系統都會用到的啦

而且要處理的方式還是有很多的不同

光是要計算日期區間可能就有很多人很多方式了

最近剛好看到就去找了一些方式小小整理了一下下

方便日後使用...不足的Google一下我想一定是沒有問題

我把找到的或是有用到的都轉成C#的呈現了

下面是我把整個.cs檔都貼上了

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Microsoft.VisualBasic;
using System.Globalization;

public partial class DemoDateTime : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //取目前週數
        Response.Write(GetWeekOfNow() + "
");
        Response.Write(GetWeekOfNow2() + "
");
        Response.Write(GetWeekOfNow3() + "
");
        //VB.NET的取週數好像更簡單就這麼一行就結束了
        //Response.Write(DatePart(DateInterval.WeekOfYear, DateTime.Today))

        //取得月數
        TimeSpan ts = new TimeSpan(Convert.ToDateTime("2010/6/30").Ticks - Convert.ToDateTime("2010/1/1").Ticks);
        Response.Write(Math.Round((ts.TotalDays / 365) * 12, 2) + "
");

        //取得月數
        Double tsd = (ts.TotalDays / 365) * 12;
        Response.Write(tsd.ToString("#.#0") + "
");

        //取得月數
        Double diff = DateDiff("Month", Convert.ToDateTime("2010/1/1"), Convert.ToDateTime("2010/6/30"));
        Response.Write(diff + "
");

        //取得月數
        Double diffvb = DateDiffvb(Microsoft.VisualBasic.DateInterval.Month, Convert.ToDateTime("2010/1/1"), Convert.ToDateTime("2010/6/30"));
        Response.Write(diffvb + "
");

        //取得月數
        Double diff2 = DateDiff2(DateInterval.Month, Convert.ToDateTime("2010/1/1"), Convert.ToDateTime("2010/6/30"));
        Response.Write(diff2 + "
");

        //取得天數
        int days = DateTime.DaysInMonth(DateTime.Now.Year, DateTime.Now.Month);
        Response.Write(days + "
");

        //取得二個日期相差時間
        DateTime objStartTime = new DateTime(2010, 1, 1, 0, 0, 0);
        DateTime objEndTime = new DateTime(2010, 6, 9, 0, 0, 0);
        TimeSpan objTimeSpan = objEndTime.Subtract(objStartTime);
        string strDiff = string.Empty;
        strDiff = "相差:" + objTimeSpan.Days.ToString() + "天
或"
                  + (objTimeSpan.Days * 24) + "小時
或"
                  + (objTimeSpan.Days * 24 * 60) + "分鍾
或"
                  + (objTimeSpan.Days * 24 * 60 * 60) + "秒
";
        Response.Write(strDiff + "
");

        //國家日期格式設定CultureInfo
        CultureInfo ci = new CultureInfo("zh-tw");
        System.Globalization.Calendar cal = new TaiwanCalendar();
        ci.DateTimeFormat.Calendar = cal;
        DateTime dt = DateTime.Parse("2010/06/09");
        string strWareki = dt.ToString("ggyy/MM/dd", ci);
        Response.Write(strWareki + "
");
        // Result: 中華民國99/06/09 

        ci.DateTimeFormat.Calendar = cal;
        string strWareki2 = "中華民國99/06/09";
        string strDate = DateTime.ParseExact(strWareki2, "ggyy/MM/dd", ci).ToString("yyyy/MM/dd");
        Response.Write(strDate + "
");
        // Result: 2010/06/09 

        System.Globalization.CultureInfo cuinfo = new System.Globalization.CultureInfo("zh-TW",true);
        cuinfo.DateTimeFormat.Calendar = cuinfo.OptionalCalendars[2];
        // [0]『西曆(中文)』,Calendar Type : "System.Globalization.GregorianCalendar"
        // [1]『西曆(英文)』,Calendar Type : "System.Globalization.GregorianCalendar"
        // [2]『中華民國曆』,Calendar Type : "System.Globalization.TaiwanCalendar"
        System.Threading.Thread.CurrentThread.CurrentCulture = cuinfo;
        System.Threading.Thread.CurrentThread.CurrentUICulture = cuinfo;
        string strNonDate = DateTime.Now.ToString(cuinfo);
        Response.Write(strNonDate + "
");
        // Result: 99/6/9 下午 03:34:23 
    }

    public static int GetWeekOfNow()
    {

        DateTime dt = DateTime.Now.Date;
        int weeknow = Convert.ToInt32(dt.DayOfWeek);
        int daydiff = (-1) * (weeknow + 1);
        int days = System.DateTime.Now.AddDays(daydiff).DayOfYear;
        int weeks = days / 7;
        if (days % 7 != 0)
        {
            weeks++;
        }
        return weeks;
    }

    private int GetWeekOfNow2(DateTime CurrDate)
    {
        DateTime dtYear = new DateTime(CurrDate.Year, 1, 1);
        int dtStarWeek = (int)dtYear.DayOfWeek;
        int dtDays = CurrDate.DayOfYear + dtStarWeek;
        if (dtDays < 7)
            return 1;

        int dtValue = (dtDays / 7);
        if (dtDays % 7 != 0)
            dtValue++;

        return dtValue;
    }

    private string GetWeekOfNow3()
    {
        System.Globalization.GregorianCalendar gc = new System.Globalization.GregorianCalendar();
        int weekOfYear = gc.GetWeekOfYear(DateTime.Now, System.Globalization.CalendarWeekRule.FirstDay, DayOfWeek.Sunday);
        string week = Convert.ToString(weekOfYear);
        if (week.Length == 1)
            week = '0' + week;

        return week;
    }

    private double DateDiff(string DateType, DateTime startDate, DateTime endDate)
    {
        double diff = 0.00;
        System.TimeSpan TS = new System.TimeSpan(endDate.Ticks - startDate.Ticks);

        switch (DateType.ToUpper())
        {
            case "YEAR":
                diff = Convert.ToDouble(TS.TotalDays / 365);
                break;
            case "MONTH":
                diff = Convert.ToDouble((TS.TotalDays / 365) * 12);
                break;
            case "DAY":
                diff = Convert.ToDouble(TS.TotalDays);
                break;
            case "HOUR":
                diff = Convert.ToDouble(TS.TotalHours);
                break;
            case "MINUTE":
                diff = Convert.ToDouble(TS.TotalMinutes);
                break;
            case "SECOND":
                diff = Convert.ToDouble(TS.TotalSeconds);
                break;
        }

        return diff;
    }

    public double DateDiffvb(DateInterval Interval, DateTime startDate, DateTime endDate)
    {
        return Microsoft.VisualBasic.DateAndTime.DateDiff(Interval, startDate, endDate,
            Microsoft.VisualBasic.FirstDayOfWeek.System, Microsoft.VisualBasic.FirstWeekOfYear.System);
    }

    public static long DateDiff2(DateInterval Interval, System.DateTime StartDate, System.DateTime EndDate)
    {
        long lngDateDiffValue = 0;
        System.TimeSpan TS = new System.TimeSpan(EndDate.Ticks - StartDate.Ticks);
        switch (Interval)
        {
            case DateInterval.Second:
                lngDateDiffValue = (long)TS.TotalSeconds;
                break;
            case DateInterval.Minute:
                lngDateDiffValue = (long)TS.TotalMinutes;
                break;
            case DateInterval.Hour:
                lngDateDiffValue = (long)TS.TotalHours;
                break;
            case DateInterval.Day:
                lngDateDiffValue = (long)TS.Days;
                break;
            case DateInterval.Weekday:
                lngDateDiffValue = (long)(TS.Days / 7);
                break;
            case DateInterval.Month:
                lngDateDiffValue = (long)(TS.Days / 30);
                break;
            case DateInterval.Quarter:
                lngDateDiffValue = (long)((TS.Days / 30) / 3);
                break;
            case DateInterval.Year:
                lngDateDiffValue = (long)(TS.Days / 365);
                break;
        }
        return (lngDateDiffValue);
    }
}