java中常用的时间方法

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package com.accp.office.util;


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 TimeUtil {
 //用来全局控制 上一周，本周，下一周的周数变化
    private  static int weeks = 0;
    private static int MaxDate;//一月最大天数
    private static int MaxYear;//一年最大天数
 
    static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
	/**
	 * 获取每个月的最后一天不带时分秒
	 * @author 吕兵阳
	 * @return
	 */
	public static Date getLastDayOfMonth(Calendar cal){
		String lastDay = cal.get(Calendar.YEAR)+"-"+(cal.get(Calendar.MONTH)+1)+"-"+cal.getActualMaximum(Calendar.DAY_OF_MONTH);
		try {
			return sdf.parse(lastDay);
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("获取当前时间失败！");
			return null;
		}
	}
	/**
	 * 获取一个月的第一天不带时分秒
	 * @author 吕兵阳
	 * @param cal
	 * @return
	 */
	public static Date getFirstDayOfMonth(Calendar cal) {
		String firstDay = cal.get(Calendar.YEAR)+"-"+(cal.get(Calendar.MONTH)+1)+"-"+01;
		try {
			return sdf.parse(firstDay);
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("获取当前时间失败！");
			return null;
		}
	}
	/**
	 * 获取今天不带时分秒
	 * @author 吕兵阳
	 * @param cal
	 * @return
	 */
	public static Date getTime(Calendar cal){
		String now = cal.get(Calendar.YEAR)+"-"+(cal.get(Calendar.MONTH)+1)+"-"+cal.get(Calendar.DAY_OF_MONTH);
		try {
			return sdf.parse(now);
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("获取时间失败！");
			return null;
		}
	}
	/**
	 * 获取明天不带时分秒
	 * @author 吕兵阳
	 * @param cal
	 * @return
	 */
	public static Date getTomorrow(Calendar cal){
		String tomorrow = cal.get(Calendar.YEAR)+"-"+(cal.get(Calendar.MONTH)+1)+"-"+(cal.get(Calendar.DAY_OF_MONTH)+2);
		try {
			return sdf.parse(tomorrow);
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("获取时间出错！");
			return null;
		}
	}
	
/**
 * 将一个字符串转换为一个日期对象
 * @description	
 * @author  吕兵阳
 * @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;
 }
 /**
	 * 获取两个时间相差的天数
	 * @description	
	 * @author  吕兵阳
	 * @param sj1 时间1
	 * @param sj2 时间2
	 * @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;
 }
 /**
  * 获取当月最后一天,返回日期的字符串
  * @description	
  * @author  吕兵阳
  * @return
  */
 public static String getLastDayofMonth(){ 
    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; 
 }
 
 /**
  * 获取上个月第一天,返回标准的日期字符串
  * @description	
  * @author  吕兵阳
  * @return
  */
 public static 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; 
 }
 
 	/**
 	 * 获取本周周日的日期,返回标准的日期字符串
 	 * @description	
 	 * @author  吕兵阳
 	 * @return
 	 */
    public static String getCurrentWeekday() {
        weeks = 0;
        int mondayPlus = 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;
    }
   
   
    /**
     * 获得当前日期与本周日相差的天数
     * @description	
     * @author  吕兵阳
     * @return
     */
    private static 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
     * @description	
     * @author  吕兵阳
     * @return
     */
    public static String getMondayOFWeek(){
      weeks = 0;
         int mondayPlus = 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
   * @description	
   * @author  吕兵阳
   * @return
   */
    public static String getSaturday() {
        int mondayPlus = getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 5);
        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
     * @description	
     * @author  吕兵阳
     * @return
     */
    public static String getPreviousWeekSunday() {
     weeks=0;
        weeks--;
        int mondayPlus =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
     * @description	
     * @author  吕兵阳
     * @return
     */
    public static String getPreviousWeekday() {
        weeks--;
        int mondayPlus =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
     * @description	
     * @author  吕兵阳
     * @return
     */
    public static String getNextMonday() {
        weeks++;
        int mondayPlus = 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
  * @description	
  * @author  吕兵阳
  * @return
  */
    public static String getNextSunday() {
       
        int mondayPlus =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;
    }
   
   /**
    * 月份的计算
    * @description	
    * @author  吕兵阳
    * @return
    */
    private static 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
   * @description	
   * @author  吕兵阳
   * @return
   */
    public static 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
   * @description	
   * @author  吕兵阳
   * @return
   */
    public static 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
   * @description	
   * @author  吕兵阳
   * @return
   */
    public static 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
     * @description	
     * @author  吕兵阳
     * @return
     */
    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
   * @description	
   * @author  吕兵阳
   * @return
   */
    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
   * @description	
   * @author  吕兵阳
   * @return
   */
    public static 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;
    }
    
    public static 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
     * @description	
     * @author  吕兵阳
     * @return
     */
    public static String getCurrentYearFirst(){
     int yearPlus = 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 
   * @description	
   * @author  吕兵阳
   * @return
   */
    public static 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
   * @description	
   * @author  吕兵阳
   * @return
   */
    public static 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
   * @description	
   * @author  吕兵阳
   * @return
   */
    public static String getPreviousYearEnd(){
     weeks--;
     int yearPlus =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;
    }
   
  /**
   * 获得季度的开始日期和结束日期
   * @description	
   * @author  吕兵阳
   * @param month
   * @return
   */
 public static 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 static 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 static boolean isLeapYear(int year) {
        return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
  }
}

 

 

下面是junit测试:

 

 @Test
    public void test4(){
    	logger.info("两个时间相差几天:"+TimeUtil.getDays("2013-10-10", "2013-10-09"));
    	logger.info("你输入的字符串转换为日期后是:"+TimeUtil.strToDate("2013-12-6"));
    	logger.info("当月最后一天:"+TimeUtil.getLastDayofMonth());
    	logger.info("上个月第一天:"+TimeUtil.getPreviousMonthFirst());
    	logger.info("本周周日的日期是:"+TimeUtil.getCurrentWeekday());
    	logger.info("本周一的日期:"+TimeUtil.getMondayOFWeek());
    	logger.info("获得相应周的周六的日期:"+TimeUtil.getSaturday());
    	logger.info("获得上周星期日的日期:"+TimeUtil.getPreviousWeekSunday());
    	logger.info("获得上周星期一的日期:"+TimeUtil.getPreviousWeekday());
    	logger.info("获得下周星期一的日期:"+TimeUtil.getNextMonday());
    	logger.info("获得下周星期日的日期:"+TimeUtil.getNextSunday());
    	logger.info("本年有:"+TimeUtil.getMaxYear()+"天!");
    	logger.info("季度的开始和结束:"+TimeUtil.getThisSeasonTime(1));
    }