Java日期大总结

package com.hefeng.test; 
 
 
import java.text.DateFormat; 
import java.text.ParsePosition; 
import java.text.SimpleDateFormat; 
import java.util.Calendar; 
import java.util.Date; 
import java.util.GregorianCalendar; 
 
public class TimeTest { 
    //用来全局控制 上一周，本周，下一周的周数变化 
    private  int weeks = 0; 
    private int MaxDate;//一月最大天数 
    private int MaxYear;//一年最大天数 
     
     
    /**
     * @param args
     */ 
    public static void main(String[] args) { 
        TimeTest tt = new TimeTest(); 
        System.out.println("获取当天日期:"+tt.getNowTime("yyyy-MM-dd")); 
        System.out.println("获取本周一日期:"+tt.getMondayOFWeek()); 
        System.out.println("获取本周日的日期~:"+tt.getCurrentWeekday()); 
        System.out.println("获取上周一日期:"+tt.getPreviousWeekday()); 
        System.out.println("获取上周日日期:"+tt.getPreviousWeekSunday()); 
        System.out.println("获取下周一日期:"+tt.getNextMonday()); 
        System.out.println("获取下周日日期:"+tt.getNextSunday()); 
        System.out.println("获得相应周的周六的日期:"+tt.getNowTime("yyyy-MM-dd")); 
        System.out.println("获取本月第一天日期:"+tt.getFirstDayOfMonth()); 
        System.out.println("获取本月最后一天日期:"+tt.getDefaultDay()); 
        System.out.println("获取上月第一天日期:"+tt.getPreviousMonthFirst()); 
        System.out.println("获取上月最后一天的日期:"+tt.getPreviousMonthEnd()); 
        System.out.println("获取下月第一天日期:"+tt.getNextMonthFirst()); 
        System.out.println("获取下月最后一天日期:"+tt.getNextMonthEnd()); 
        System.out.println("获取本年的第一天日期:"+tt.getCurrentYearFirst()); 
        System.out.println("获取本年最后一天日期:"+tt.getCurrentYearEnd()); 
        System.out.println("获取去年的第一天日期:"+tt.getPreviousYearFirst()); 
        System.out.println("获取去年的最后一天日期:"+tt.getPreviousYearEnd()); 
        System.out.println("获取明年第一天日期:"+tt.getNextYearFirst()); 
        System.out.println("获取明年最后一天日期:"+tt.getNextYearEnd()); 
        System.out.println("获取本季度第一天到最后一天:"+tt.getThisSeasonTime(11)); 
        System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"+TimeTest.getTwoDay("2008-12-1","2008-9-29")); 
    } 
     
     
    /**
        * 得到二个日期间的间隔天数
        */ 
    public static String getTwoDay(String sj1, String sj2) { 
        SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); 
        long day = 0; 
        try { 
         java.util.Date date = myFormatter.parse(sj1); 
         java.util.Date mydate = myFormatter.parse(sj2); 
         day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); 
        } catch (Exception e) { 
         return ""; 
        } 
        return day + ""; 
    } 
 
 
    /**
        * 根据一个日期，返回是星期几的字符串
        * 
        * @param sdate
        * @return
        */ 
    public static String getWeek(String sdate) { 
        // 再转换为时间 
        Date date = TimeTest.strToDate(sdate); 
        Calendar c = Calendar.getInstance(); 
        c.setTime(date); 
        // int hour=c.get(Calendar.DAY_OF_WEEK); 
        // hour中存的就是星期几了，其范围 1~7 
        // 1=星期日 7=星期六，其他类推 
        return new SimpleDateFormat("EEEE").format(c.getTime()); 
    } 
 
    /**
        * 将短时间格式字符串转换为时间 yyyy-MM-dd 
        * 
        * @param strDate
        * @return
        */ 
    public static Date strToDate(String strDate) { 
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); 
        ParsePosition pos = new ParsePosition(0); 
        Date strtodate = formatter.parse(strDate, pos); 
        return strtodate; 
    } 
 
    /**
        * 两个时间之间的天数
        * 
        * @param date1
        * @param date2
        * @return
        */ 
    public static long getDays(String date1, String date2) { 
        if (date1 == null || date1.equals("")) 
         return 0; 
        if (date2 == null || date2.equals("")) 
         return 0; 
        // 转换为标准时间 
        SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); 
        java.util.Date date = null; 
        java.util.Date mydate = null; 
        try { 
         date = myFormatter.parse(date1); 
         mydate = myFormatter.parse(date2); 
        } catch (Exception e) { 
        } 
        long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); 
        return day; 
    } 
 
 
 
     
    // 计算当月最后一天,返回字符串 
    public String getDefaultDay(){   
       String str = ""; 
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
 
       Calendar lastDate = Calendar.getInstance(); 
       lastDate.set(Calendar.DATE,1);//设为当前月的1号 
       lastDate.add(Calendar.MONTH,1);//加一个月，变为下月的1号 
       lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天 
        
       str=sdf.format(lastDate.getTime()); 
       return str;   
    } 
     
    // 上月第一天 
    public String getPreviousMonthFirst(){   
       String str = ""; 
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
 
       Calendar lastDate = Calendar.getInstance(); 
       lastDate.set(Calendar.DATE,1);//设为当前月的1号 
       lastDate.add(Calendar.MONTH,-1);//减一个月，变为下月的1号 
       //lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天 
        
       str=sdf.format(lastDate.getTime()); 
       return str;   
    } 
     
    //获取当月第一天 
    public String getFirstDayOfMonth(){   
       String str = ""; 
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
 
       Calendar lastDate = Calendar.getInstance(); 
       lastDate.set(Calendar.DATE,1);//设为当前月的1号 
       str=sdf.format(lastDate.getTime()); 
       return str;   
    } 
     
    // 获得本周星期日的日期   
    public String getCurrentWeekday() { 
        weeks = 0; 
        int mondayPlus = this.getMondayPlus(); 
        GregorianCalendar currentDate = new GregorianCalendar(); 
        currentDate.add(GregorianCalendar.DATE, mondayPlus+6); 
        Date monday = currentDate.getTime(); 
         
        DateFormat df = DateFormat.getDateInstance(); 
        String preMonday = df.format(monday); 
        return preMonday; 
    } 
     
     
    //获取当天时间  
    public String getNowTime(String dateformat){ 
        Date   now   =   new   Date();    
        SimpleDateFormat   dateFormat   =   new   SimpleDateFormat(dateformat);//可以方便地修改日期格式    
        String  hehe  = dateFormat.format(now);    
        return hehe; 
    } 
     
    // 获得当前日期与本周日相差的天数 
    private int getMondayPlus() { 
        Calendar cd = Calendar.getInstance(); 
        // 获得今天是一周的第几天，星期日是第一天，星期二是第二天...... 
        int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK)-1;         //因为按中国礼拜一作为第一天所以这里减1 
        if (dayOfWeek == 1) { 
            return 0; 
        } else { 
            return 1 - dayOfWeek; 
        } 
    } 
     
    //获得本周一的日期 
    public String getMondayOFWeek(){ 
         weeks = 0; 
         int mondayPlus = this.getMondayPlus(); 
         GregorianCalendar currentDate = new GregorianCalendar(); 
         currentDate.add(GregorianCalendar.DATE, mondayPlus); 
         Date monday = currentDate.getTime(); 
          
         DateFormat df = DateFormat.getDateInstance(); 
         String preMonday = df.format(monday); 
         return preMonday; 
    } 
     
  //获得相应周的周六的日期 
    public String getSaturday() { 
        int mondayPlus = this.getMondayPlus(); 
        GregorianCalendar currentDate = new GregorianCalendar(); 
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6); 
        Date monday = currentDate.getTime(); 
        DateFormat df = DateFormat.getDateInstance(); 
        String preMonday = df.format(monday); 
        return preMonday; 
    } 
     
// 获得上周星期日的日期 
    public String getPreviousWeekSunday() { 
        weeks=0; 
        weeks--; 
        int mondayPlus = this.getMondayPlus(); 
        GregorianCalendar currentDate = new GregorianCalendar(); 
        currentDate.add(GregorianCalendar.DATE, mondayPlus+weeks); 
        Date monday = currentDate.getTime(); 
        DateFormat df = DateFormat.getDateInstance(); 
        String preMonday = df.format(monday); 
        return preMonday; 
    } 
 
// 获得上周星期一的日期 
    public String getPreviousWeekday() { 
        weeks--; 
        int mondayPlus = this.getMondayPlus(); 
        GregorianCalendar currentDate = new GregorianCalendar(); 
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks); 
        Date monday = currentDate.getTime(); 
        DateFormat df = DateFormat.getDateInstance(); 
        String preMonday = df.format(monday); 
        return preMonday; 
    } 
     
    // 获得下周星期一的日期 
    public String getNextMonday() { 
        weeks++; 
        int mondayPlus = this.getMondayPlus(); 
        GregorianCalendar currentDate = new GregorianCalendar(); 
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7); 
        Date monday = currentDate.getTime(); 
        DateFormat df = DateFormat.getDateInstance(); 
        String preMonday = df.format(monday); 
        return preMonday; 
    } 
     
// 获得下周星期日的日期 
    public String getNextSunday() { 
         
        int mondayPlus = this.getMondayPlus(); 
        GregorianCalendar currentDate = new GregorianCalendar(); 
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7+6); 
        Date monday = currentDate.getTime(); 
        DateFormat df = DateFormat.getDateInstance(); 
        String preMonday = df.format(monday); 
        return preMonday; 
    } 
     
     
     
    private int getMonthPlus(){ 
        Calendar cd = Calendar.getInstance(); 
        int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH); 
        cd.set(Calendar.DATE, 1);//把日期设置为当月第一天  
        cd.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天  
        MaxDate=cd.get(Calendar.DATE);  
        if(monthOfNumber == 1){ 
            return -MaxDate; 
        }else{ 
            return 1-monthOfNumber; 
        } 
    } 
     
  //获得上月最后一天的日期 
    public String getPreviousMonthEnd(){ 
        String str = ""; 
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
 
       Calendar lastDate = Calendar.getInstance(); 
      lastDate.add(Calendar.MONTH,-1);//减一个月 
      lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天  
      lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天  
       str=sdf.format(lastDate.getTime()); 
       return str;   
    } 
     
  //获得下个月第一天的日期 
    public String getNextMonthFirst(){ 
        String str = ""; 
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
 
       Calendar lastDate = Calendar.getInstance(); 
      lastDate.add(Calendar.MONTH,1);//减一个月 
      lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天  
       str=sdf.format(lastDate.getTime()); 
       return str;   
    } 
     
  //获得下个月最后一天的日期 
    public String getNextMonthEnd(){ 
        String str = ""; 
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
 
       Calendar lastDate = Calendar.getInstance(); 
      lastDate.add(Calendar.MONTH,1);//加一个月 
      lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天  
      lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天  
       str=sdf.format(lastDate.getTime()); 
       return str;   
    } 
     
    //获得明年最后一天的日期 
    public String getNextYearEnd(){ 
        String str = ""; 
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
 
      Calendar lastDate = Calendar.getInstance(); 
      lastDate.add(Calendar.YEAR,1);//加一个年 
      lastDate.set(Calendar.DAY_OF_YEAR, 1); 
     lastDate.roll(Calendar.DAY_OF_YEAR, -1); 
       str=sdf.format(lastDate.getTime()); 
       return str;   
    } 
     
  //获得明年第一天的日期 
    public String getNextYearFirst(){ 
        String str = ""; 
       SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");     
 
      Calendar lastDate = Calendar.getInstance(); 
      lastDate.add(Calendar.YEAR,1);//加一个年 
      lastDate.set(Calendar.DAY_OF_YEAR, 1); 
           str=sdf.format(lastDate.getTime()); 
      return str;   
         
    } 
     
  //获得本年有多少天 
    private int getMaxYear(){ 
        Calendar cd = Calendar.getInstance(); 
        cd.set(Calendar.DAY_OF_YEAR,1);//把日期设为当年第一天 
        cd.roll(Calendar.DAY_OF_YEAR,-1);//把日期回滚一天。 
        int MaxYear = cd.get(Calendar.DAY_OF_YEAR);  
        return MaxYear; 
    } 
     
    private int getYearPlus(){ 
        Calendar cd = Calendar.getInstance(); 
        int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);//获得当天是一年中的第几天 
        cd.set(Calendar.DAY_OF_YEAR,1);//把日期设为当年第一天 
        cd.roll(Calendar.DAY_OF_YEAR,-1);//把日期回滚一天。 
        int MaxYear = cd.get(Calendar.DAY_OF_YEAR); 
        if(yearOfNumber == 1){ 
            return -MaxYear; 
        }else{ 
            return 1-yearOfNumber; 
        } 
    } 
  //获得本年第一天的日期 
    public String getCurrentYearFirst(){ 
        int yearPlus = this.getYearPlus(); 
        GregorianCalendar currentDate = new GregorianCalendar(); 
        currentDate.add(GregorianCalendar.DATE,yearPlus); 
        Date yearDay = currentDate.getTime(); 
        DateFormat df = DateFormat.getDateInstance(); 
        String preYearDay = df.format(yearDay); 
        return preYearDay; 
    } 
     
     
  //获得本年最后一天的日期 * 
    public String getCurrentYearEnd(){ 
        Date date = new Date(); 
        SimpleDateFormat   dateFormat   =   new   SimpleDateFormat("yyyy");//可以方便地修改日期格式    
        String  years  = dateFormat.format(date);    
        return years+"-12-31"; 
    } 
     
     
  //获得上年第一天的日期 * 
    public String getPreviousYearFirst(){ 
        Date date = new Date(); 
        SimpleDateFormat   dateFormat   =   new   SimpleDateFormat("yyyy");//可以方便地修改日期格式    
        String  years  = dateFormat.format(date); int years_value = Integer.parseInt(years);   
        years_value--; 
        return years_value+"-1-1"; 
    } 
     
  //获得上年最后一天的日期 
    public String getPreviousYearEnd(){ 
        weeks--; 
        int yearPlus = this.getYearPlus(); 
        GregorianCalendar currentDate = new GregorianCalendar(); 
        currentDate.add(GregorianCalendar.DATE,yearPlus+MaxYear*weeks+(MaxYear-1)); 
        Date yearDay = currentDate.getTime(); 
        DateFormat df = DateFormat.getDateInstance(); 
        String preYearDay = df.format(yearDay); 
        getThisSeasonTime(11); 
        return preYearDay; 
    } 
     
  //获得本季度 
    public String getThisSeasonTime(int month){ 
        int array[][] = {{1,2,3},{4,5,6},{7,8,9},{10,11,12}}; 
        int season = 1; 
        if(month>=1&&month<=3){ 
            season = 1; 
        } 
        if(month>=4&&month<=6){ 
            season = 2; 
        } 
        if(month>=7&&month<=9){ 
            season = 3; 
        } 
        if(month>=10&&month<=12){ 
            season = 4; 
        } 
        int start_month = array[season-1][0]; 
        int end_month = array[season-1][2]; 
         
        Date date = new Date(); 
        SimpleDateFormat   dateFormat   =   new   SimpleDateFormat("yyyy");//可以方便地修改日期格式    
        String  years  = dateFormat.format(date);    
        int years_value = Integer.parseInt(years); 
         
        int start_days =1;//years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month); 
        int end_days = getLastDayOfMonth(years_value,end_month); 
        String seasonDate = years_value+"-"+start_month+"-"+start_days+";"+years_value+"-"+end_month+"-"+end_days; 
        return seasonDate; 
         
    } 
     
    /**
     * 获取某年某月的最后一天
     * @param year 年
     * @param month 月
     * @return 最后一天
     */ 
   private int getLastDayOfMonth(int year, int month) { 
         if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 
                   || month == 10 || month == 12) { 
               return 31; 
         } 
         if (month == 4 || month == 6 || month == 9 || month == 11) { 
               return 30; 
         } 
         if (month == 2) { 
               if (isLeapYear(year)) { 
                   return 29; 
               } else { 
                   return 28; 
               } 
         } 
         return 0; 
   } 
   /**
    * 是否闰年
    * @param year 年
    * @return 
    */ 
  public boolean isLeapYear(int year) { 
        return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0); 
  } 
}