Java获取各种常用时间方法

http://gigixin.iteye.com/blog/406764
http://faq.csdn.net/read/207712.html
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



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"));
}



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 + "";
}



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());
}


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;
}


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;
 
}


   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;
   }
 
  public boolean isLeapYear(int year) {
        return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
  }
}