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關(guān)于Java日期工具類(lèi)的編寫(xiě)

 更新時(shí)間：2023年05月04日 09:16:11   作者：wespten  
這篇文章主要介紹了關(guān)于Java日期工具類(lèi)的編寫(xiě),在Java開(kāi)發(fā)中,經(jīng)常會(huì)遇到處理日期相關(guān)的數(shù)據(jù),那么今天我們來(lái)自己寫(xiě)一個(gè)工具類(lèi),文中有詳細(xì)的實(shí)例代碼以及實(shí)現(xiàn)思路,需要的朋友可以參考下

Java日期工具類(lèi)編寫(xiě)

將字符串轉(zhuǎn)換為對(duì)應(yīng)日期

Date date = simpleDateFormat.parse(string);

將日期轉(zhuǎn)換為字符串

String string = simpleDateFormat.format(date);

注意，因?yàn)榭赡芏x的格式和實(shí)際字符串提供的格式不符合，所以會(huì)拋出異常。

將年月日的漢字日期轉(zhuǎn)為 - - 分隔符的日期

public static void main(String[] args) throws ParseException {
		//統(tǒng)一日期格式
		String StrVal = "2018年05月22日";
		Date d1 = new SimpleDateFormat("yyyy年MM月dd日").parse(StrVal);
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		String time = format.format(d1);
		System.out.println(time);
	}

    /**
     * 將日期對(duì)象格式化為指定格式的日期字符串
     * @param date 傳入的日期對(duì)象
     * @param format 格式
     * @return
     */
    public static String formatDate(Date date,String format){
        String result="";
        SimpleDateFormat sdf=new SimpleDateFormat(format);
        if(date!=null){
            result=sdf.format(date);
        }
        return result;
    }
    /**
     * 將日期字符串轉(zhuǎn)換成一個(gè)日期對(duì)象 
     * @param dateStr 日期字符串
     * @param format 格式
     * @return
     * @throws ParseException 
     */
    public static Date formatDate(String dateStr,String format) throws ParseException{
        SimpleDateFormat sdf=new SimpleDateFormat(format);
        return sdf.parse(dateStr);
    }
    public static void main(String[] args) throws ParseException {
        Date date=new Date();
        System.out.println(formatDate(date,"yyyy-MM-dd"));
        System.out.println(formatDate(date,"yyyy-MM-dd HH:mm:ss"));
        System.out.println(formatDate(date,"yyyy年MM月dd日HH時(shí)mm分ss秒"));
        String dataStr="1989-11-02 18:01:41";
        Date date2=formatDate(dataStr,"yyyy-MM-dd HH:mm:ss");
        System.out.println(formatDate(date2,"yyyy-MM-dd HH:mm:ss"));
    }

運(yùn)行輸出：

2016-11-02

2016-11-02 18:06:50

2016年11月02日18時(shí)06分50秒

1989-11-02 18:01:41

SimpleDateFormat類(lèi)主要是用作日期類(lèi)型轉(zhuǎn)換用的，常用的日期格式化

    public static void main(String[] args) {
        //默認(rèn)輸出格式
        Date date=new Date();
        System.out.println(date);
        //日期格式化顯示，首先定義格式
        SimpleDateFormat sdf1=new SimpleDateFormat("yyyyMMdd");
        SimpleDateFormat sdf2=new SimpleDateFormat("yyyy-MM-dd");
        SimpleDateFormat sdf3=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        SimpleDateFormat sdf4=new SimpleDateFormat("yyyy年MM月dd日HH時(shí)mm分ss秒");
        //將格式應(yīng)用于日期
        System.out.println(sdf1.format(date));
        System.out.println(sdf2.format(date));
        System.out.println(sdf3.format(date));
        System.out.println(sdf4.format(date));
    }

JavaCalendar日歷類(lèi)的時(shí)間操作

Calendar有個(gè)DAY_OF_WEEK 可以返回一個(gè)星期中的第幾天；

這里說(shuō)下注意點(diǎn) 老外的第一天是從星期日開(kāi)始的，所以要-1；

import java.util.Calendar;
public class Test {
    public static void main(String[] args) {
        String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
        Calendar calendar=Calendar.getInstance();
        System.out.println("今天是"+weekDays[calendar.get(Calendar.DAY_OF_WEEK)-1]);
    }
}

對(duì)日歷進(jìn)行操作

    public static void main(String[] args) {
        //默認(rèn)輸出格式
    	Date now = new Date();
	SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
	String time = format.format(now);
	System.out.println(time);
    	Calendar calendar = Calendar.getInstance();
    	calendar.setTime(now);
    	calendar.add(Calendar.MONTH, 1);
    	SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    	String nowTime = sdf.format(calendar.getTime());
    	System.out.println(nowTime);
    	calendar.add(Calendar.MONTH, -2);
    	String nowTime2 = sdf.format(calendar.getTime());
    	System.out.println(nowTime2);
    }

獲取時(shí)間

賦值時(shí)年月日時(shí)分秒常用的6個(gè)值，注意月份下標(biāo)從0開(kāi)始，所以取月份要+1

    public static void main(String[] args) {
        //默認(rèn)輸出格式
    	Date now = new Date();
    	SimpleDateFormat nowSdf = new SimpleDateFormat("yyyy-MM-dd");
        System.out.println(nowSdf.format(now));
        Calendar calendar = Calendar.getInstance();
        // 賦值時(shí)年月日時(shí)分秒常用的6個(gè)值，注意月份下標(biāo)從0開(kāi)始，所以取月份要+1
        System.out.println("年:" + calendar.get(Calendar.YEAR));
        System.out.println("月:" + (calendar.get(Calendar.MONTH) + 1));       
        System.out.println("日:" + calendar.get(Calendar.DAY_OF_MONTH));
        System.out.println("時(shí):" + calendar.get(Calendar.HOUR_OF_DAY));
        System.out.println("分:" + calendar.get(Calendar.MINUTE));
        System.out.println("秒:" + calendar.get(Calendar.SECOND));
    	SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    	String nowTime2 = sdf.format(calendar.getTime());
    	System.out.println(nowTime2);
    }

設(shè)置時(shí)間 

如果想設(shè)置為某個(gè)日期，可以一次設(shè)置年月日時(shí)分秒，由于月份下標(biāo)從0開(kāi)始賦值月份要-1

    public static void main(String[] args) {
        //默認(rèn)輸出格式
    	Date now = new Date();
    	SimpleDateFormat nowSdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        System.out.println(nowSdf.format(now));
        Calendar calendar = Calendar.getInstance();
        calendar.set(2013, 5, 4, 13, 44, 51);
        calendar.set(Calendar.YEAR, 2014);//年 
    	SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    	String nowTime = sdf.format(calendar.getTime());
    	System.out.println(nowTime);
        calendar.set(Calendar.MONTH, 7);//月（月份0代表1月） 
    	SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    	String nowTime1 = sdf1.format(calendar.getTime());
    	System.out.println(nowTime1);
        calendar.set(Calendar.DATE, 11);//日 
        calendar.set(Calendar.HOUR_OF_DAY, 15);//時(shí) 
        calendar.set(Calendar.MINUTE, 33);//分 
        calendar.set(Calendar.SECOND, 32);//秒 
    }

時(shí)間計(jì)算

    public static void main(String[] args) {
        //默認(rèn)輸出格式
    	Date now = new Date();
    	SimpleDateFormat nowSdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        System.out.println(nowSdf.format(now));
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(now);
    	calendar.add(Calendar.YEAR, 1);//年 
    	calendar.add(Calendar.MONTH, 1);//月 
    	calendar.add(Calendar.DATE, 1);//日 
    	//calendar.add(Calendar.DAY_OF_YEAR, 1);//今年的第 N 天
    	//calendar.add(Calendar.DAY_OF_MONTH, 1); // 本月第 N 天  
    	//calendar.add(Calendar.DAY_OF_WEEK, 1);// 本周幾  
    	calendar.add(Calendar.HOUR_OF_DAY, -1);//時(shí) 
    	calendar.add(Calendar.MINUTE, 1);//分 
    	calendar.add(Calendar.SECOND, 1);//秒 
        //calendar.add(calendar.WEEK_OF_MONTH, 1);//增加一個(gè)禮拜
        //calendar.add(calendar.WEEK_OF_YEAR,1);//增加一個(gè)禮拜
       	SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    	String nowTime1 = sdf1.format(calendar.getTime());
    	System.out.println(nowTime1);
    }

日期的計(jì)算

獲取本月最小天數(shù)與最大天數(shù)

    public static void main(String[] args) {
        //默認(rèn)輸出格式
    	Date now = new Date();
    	SimpleDateFormat nowSdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    	Calendar calendar = Calendar.getInstance();   
    	int firstD = calendar.getActualMinimum(calendar.DAY_OF_MONTH);   
    	int lastD = calendar.getActualMaximum(calendar.DAY_OF_MONTH);   
    	System.out.println("獲取本月的第一天和最后天：" + firstD +"," + lastD);
    }

獲取本周星期一、上周星期一、這周星期一

    public static Date geLastWeekMonday(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(getThisWeekMonday(date));
        cal.add(Calendar.DATE, -7);
        return cal.getTime();
    }
    public static Date getThisWeekMonday(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        // 獲得當(dāng)前日期是一個(gè)星期的第幾天
        int dayWeek = cal.get(Calendar.DAY_OF_WEEK);
        if (1 == dayWeek) {
            cal.add(Calendar.DAY_OF_MONTH, -1);
        }
        // 設(shè)置一個(gè)星期的第一天，按中國(guó)的習(xí)慣一個(gè)星期的第一天是星期一
        cal.setFirstDayOfWeek(Calendar.MONDAY);
        // 獲得當(dāng)前日期是一個(gè)星期的第幾天
        int day = cal.get(Calendar.DAY_OF_WEEK);
        // 根據(jù)日歷的規(guī)則，給當(dāng)前日期減去星期幾與一個(gè)星期第一天的差值
        cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - day);
        return cal.getTime();
    }
    public static Date getNextWeekMonday(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(getThisWeekMonday(date));
        cal.add(Calendar.DATE, 7);
        return cal.getTime();
    }
    public static void main(String[] args) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        try {
            Date date = sdf.parse("2017-09-10");
            System.out.println("今天是" + sdf.format(date));
            System.out.println("上周一" + sdf.format(geLastWeekMonday(date)));
            System.out.println("本周一" + sdf.format(getThisWeekMonday(date)));
            System.out.println("下周一" + sdf.format(getNextWeekMonday(date)));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

天數(shù)計(jì)算

用Date類(lèi)計(jì)算日期差

public static void main(String[] args) {
	 Calendar love = Calendar.getInstance();  
     Calendar now = Calendar.getInstance();  
     love.set(2016, 8, 6); //真實(shí)的日期是2016-9-6;
     int days = (int) ((now.getTimeInMillis() - love.getTimeInMillis()) / (24 * 60 * 60 * 1000.0));  
     System.out.println(days); 
}

public static void main(String[] args) throws ParseException {
	SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd");//大小寫(xiě)還是很重要的
	Date LoveDay=new Date();
	Date now=new Date();
	LoveDay=format.parse("2016-08-06");
	int day=(int) ((now.getTime()-LoveDay.getTime())/(24*60*60*1000));
	System.out.println(day);
}

日期工具類(lèi)

 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.Date;
public class DateUtils {
	    public static final String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
	     public static final String MINUTE_PATTERN = "yyyy-MM-dd HH:mm";
	     public static final String HOUR_PATTERN = "yyyy-MM-dd HH:mm:ss";
	     public static final String DATE_PATTERN = "yyyy-MM-dd";
	     public static final String MONTH_PATTERN = "yyyy-MM";
	     public static final String YEAR_PATTERN = "yyyy";
	     public static final String MINUTE_ONLY_PATTERN = "mm";
	     public static final String HOUR_ONLY_PATTERN = "HH";
	          /**
	           * 日期相加減天數(shù)
	           * @param date 如果為Null，則為當(dāng)前時(shí)間
	           * @param days 加減天數(shù)
	           * @param includeTime 是否包括時(shí)分秒,true表示包含
	           * @return
	           * @throws ParseException 
	           */
	          public static Date dateAdd(Date date, int days, boolean includeTime) throws ParseException{
	              if(date == null){
	                  date = new Date();
	              }
	              if(!includeTime){
	                  SimpleDateFormat sdf = new SimpleDateFormat(DateUtils.DATE_PATTERN);
	                  date = sdf.parse(sdf.format(date));
	              }
	              Calendar cal = Calendar.getInstance();
	              cal.setTime(date);
	              cal.add(Calendar.DATE, days);
	              return cal.getTime();
	          }
	          /**
	           * 時(shí)間格式化成字符串
	           * @param date Date
	           * @param pattern StrUtils.DATE_TIME_PATTERN || StrUtils.DATE_PATTERN， 如果為空，則為yyyy-MM-dd
	           * @return
	           * @throws ParseException
	           */
	          public static String dateFormat(Date date, String pattern) throws ParseException{
	              if(pattern==null||pattern.length()==0||pattern.equals(" ")){
	                  pattern = DateUtils.DATE_PATTERN;
	              }
	              SimpleDateFormat sdf = new SimpleDateFormat(pattern);
	              return sdf.format(date);
	          }
	          /**
	           * 字符串解析成時(shí)間對(duì)象
	           * @param dateTimeString String
	           * @param pattern StrUtils.DATE_TIME_PATTERN || StrUtils.DATE_PATTERN，如果為空，則為yyyy-MM-dd
	           * @return
	           * @throws ParseException
	           */
	          public static Date dateParse(String dateTimeString, String pattern) throws ParseException{
	              if(pattern==null||pattern.length()==0||pattern.equals(" ")){
	                  pattern = DateUtils.DATE_PATTERN;
	              }
	              SimpleDateFormat sdf = new SimpleDateFormat(pattern);
	              return sdf.parse(dateTimeString);
	          }
	          /**
	           * 將日期時(shí)間格式成只有日期的字符串（可以直接使用dateFormat，Pattern為Null進(jìn)行格式化）
	           * @param dateTime Date
	           * @return
	           * @throws ParseException
	           */
	          public static String dateTimeToDateString(Date dateTime) throws ParseException{
	              String dateTimeString = DateUtils.dateFormat(dateTime, DateUtils.DATE_TIME_PATTERN);  
	              return dateTimeString.substring(0, 10); 
	          }
	             /**
	              * 當(dāng)時(shí)、分、秒為00:00:00時(shí)，將日期時(shí)間格式成只有日期的字符串，
	              * 當(dāng)時(shí)、分、秒不為00:00:00時(shí)，直接返回
	              * @param dateTime Date
	              * @return
	              * @throws ParseException
	              */
	             public static String dateTimeToDateStringIfTimeEndZero(Date dateTime) throws ParseException{
	                 String dateTimeString = DateUtils.dateFormat(dateTime, DateUtils.DATE_TIME_PATTERN);
	                 if(dateTimeString.endsWith("00:00:00")){
	                     return dateTimeString.substring(0, 10);
	                 }else{
	                     return dateTimeString;
	                 }
	             }
	             /**
	              * 將日期時(shí)間格式成日期對(duì)象，和dateParse互用
	              * @param dateTime Date
	              * @return Date
	              * @throws ParseException
	              */
	             public static Date dateTimeToDate(Date dateTime) throws ParseException{
	                 Calendar cal = Calendar.getInstance();
	                 cal.setTime(dateTime);
	                 cal.set(Calendar.HOUR_OF_DAY, 0);
	                 cal.set(Calendar.MINUTE, 0);
	                 cal.set(Calendar.SECOND, 0);
	                 cal.set(Calendar.MILLISECOND, 0);
	                 return cal.getTime();
	             }
	             /** 
	              * 時(shí)間加減小時(shí)
	              * @param startDate 要處理的時(shí)間，Null則為當(dāng)前時(shí)間 
	              * @param hours 加減的小時(shí) 
	              * @return Date 
	              */  
	             public static Date dateAddHours(Date startDate, int hours) {  
	                 if (startDate == null) {  
	                     startDate = new Date();  
	                 }  
	                 Calendar c = Calendar.getInstance();  
	                 c.setTime(startDate);  
	                 c.set(Calendar.HOUR, c.get(Calendar.HOUR) + hours);  
	                 return c.getTime();  
	             }
	             /**
	              * 時(shí)間加減分鐘
	              * @param startDate 要處理的時(shí)間，Null則為當(dāng)前時(shí)間 
	              * @param minutes 加減的分鐘
	              * @return
	              */
	             public static Date dateAddMinutes(Date startDate, int minutes) {  
	                 if (startDate == null) {  
	                     startDate = new Date();  
	                 }  
	                 Calendar c = Calendar.getInstance();  
	                 c.setTime(startDate);  
	                 c.set(Calendar.MINUTE, c.get(Calendar.MINUTE) + minutes);  
	                 return c.getTime();  
	             }
	             /**
	              * 時(shí)間加減秒數(shù)
	              * @param startDate 要處理的時(shí)間，Null則為當(dāng)前時(shí)間 
	              * @param minutes 加減的秒數(shù)
	              * @return
	              */
	             public static Date dateAddSeconds(Date startDate, int seconds) {  
	                 if (startDate == null) {  
	                     startDate = new Date();  
	                 }  
	                 Calendar c = Calendar.getInstance();  
	                 c.setTime(startDate);  
	                 c.set(Calendar.SECOND, c.get(Calendar.SECOND) + seconds);  
	                 return c.getTime();  
	               }	          
	                  /** 
	                   * 時(shí)間加減天數(shù) 
	                   * @param startDate 要處理的時(shí)間，Null則為當(dāng)前時(shí)間 
	                   * @param days 加減的天數(shù) 
	                   * @return Date 
	                   */  
	                  public static Date dateAddDays(Date startDate, int days) {  
	                      if (startDate == null) {  
	                          startDate = new Date();  
	                      }  
	                      Calendar c = Calendar.getInstance();  
	                      c.setTime(startDate);  
	                      c.set(Calendar.DATE, c.get(Calendar.DATE) + days);  
	                      return c.getTime();  
	                  }
	                  /** 
	                   * 時(shí)間加減月數(shù)
	                   * @param startDate 要處理的時(shí)間，Null則為當(dāng)前時(shí)間 
	                   * @param months 加減的月數(shù) 
	                   * @return Date 
	                   */  
	                  public static Date dateAddMonths(Date startDate, int months) {  
	                      if (startDate == null) {  
	                          startDate = new Date();  
	                      }  
	                      Calendar c = Calendar.getInstance();  
	                      c.setTime(startDate);  
	                      c.set(Calendar.MONTH, c.get(Calendar.MONTH) + months);  
	                      return c.getTime();  
	                  }
	                  /** 
	                   * 時(shí)間加減年數(shù)
	                   * @param startDate 要處理的時(shí)間，Null則為當(dāng)前時(shí)間 
	                   * @param years 加減的年數(shù) 
	                   * @return Date 
	                   */  
	                  public static Date dateAddYears(Date startDate, int years) {  
	                      if (startDate == null) {  
	                          startDate = new Date();  
	                      }  
	                      Calendar c = Calendar.getInstance();  
	                      c.setTime(startDate);  
	                      c.set(Calendar.YEAR, c.get(Calendar.YEAR) + years);  
	                      return c.getTime();  
	                  }  
	                  /** 
	                   * 時(shí)間比較（如果myDate>compareDate返回1，<返回-1，相等返回0） 
	                   * @param myDate 時(shí)間 
	                   * @param compareDate 要比較的時(shí)間 
	                   * @return int 
	                   */  
	                  public static int dateCompare(Date myDate, Date compareDate) {  
	                      Calendar myCal = Calendar.getInstance();  
	                      Calendar compareCal = Calendar.getInstance();  
	                      myCal.setTime(myDate);  
	                      compareCal.setTime(compareDate);  
	                      return myCal.compareTo(compareCal);  
	                  }
	                       /**
	                        * 獲取兩個(gè)時(shí)間中最小的一個(gè)時(shí)間
	                        * @param date
	                        * @param compareDate
	                        * @return
	                        */
	                       public static Date dateMin(Date date, Date compareDate) {
	                           if(date == null){
	                               return compareDate;
	                           }
	                           if(compareDate == null){
	                               return date;
	                           }
	                           if(1 == dateCompare(date, compareDate)){
	                               return compareDate;
	                           }else if(-1 == dateCompare(date, compareDate)){
	                               return date;
	                           }
	                           return date;  
	                       }
	                       /**
	                        * 獲取兩個(gè)時(shí)間中最大的一個(gè)時(shí)間
	                        * @param date
	                        * @param compareDate
	                        * @return
	                        */
	                       public static Date dateMax(Date date, Date compareDate) {
	                           if(date == null){
	                               return compareDate;
	                           }
	                           if(compareDate == null){
	                               return date;
	                           }
	                           if(1 == dateCompare(date, compareDate)){
	                               return date;
	                           }else if(-1 == dateCompare(date, compareDate)){
	                               return compareDate;
	                           }
	                           return date;  
	                       }
	                       /**
	                        * 獲取兩個(gè)日期（不含時(shí)分秒）相差的天數(shù)，不包含今天
	                        * @param startDate
	                        * @param endDate
	                        * @return
	                        * @throws ParseException 
	                        */
	                       public static int dateBetween(Date startDate, Date endDate) throws ParseException {
	                           Date dateStart = dateParse(dateFormat(startDate, DATE_PATTERN), DATE_PATTERN);
	                           Date dateEnd = dateParse(dateFormat(endDate, DATE_PATTERN), DATE_PATTERN);
	                           return (int) ((dateEnd.getTime() - dateStart.getTime())/1000/60/60/24); 
	                       }
	                       /**
	                        * 獲取兩個(gè)日期（不含時(shí)分秒）相差的天數(shù)，包含今天
	                        * @param startDate
	                        * @param endDate
	                        * @return
	                        * @throws ParseException 
	                        */
	                       public static int dateBetweenIncludeToday(Date startDate, Date endDate) throws ParseException {  
	                           return dateBetween(startDate, endDate) + 1;
	                       }
	                       /**
	                        * 獲取日期時(shí)間的年份，如2017-02-13，返回2017
	                        * @param date
	                        * @return
	                        */
	                       public static int getYear(Date date) {  
	                           Calendar cal = Calendar.getInstance();  
	                           cal.setTime(date);
	                           return cal.get(Calendar.YEAR);
	                       }
	                       /**
	                        * 獲取日期時(shí)間的月份，如2017年2月13日，返回2
	                        * @param date
	                        * @return
	                        */
	                       public static int getMonth(Date date) {  
	                           Calendar cal = Calendar.getInstance();  
	                           cal.setTime(date);
	                           return cal.get(Calendar.MONTH) + 1;
	                       }
	                       /**
	                        * 獲取日期時(shí)間的第幾天（即返回日期的dd），如2017-02-13，返回13
	                        * @param date
	                        * @return
	                        */
	                       public static int getDate(Date date) {  
	                           Calendar cal = Calendar.getInstance();  
	                           cal.setTime(date);
	                           return cal.get(Calendar.DATE);
	                       }
	                       /**
	                        * 獲取日期時(shí)間當(dāng)月的總天數(shù)，如2017-02-13，返回28
	                        * @param date
	                        * @return
	                        */
	                       public static int getDaysOfMonth(Date date) {  
	                           Calendar cal = Calendar.getInstance();  
	                           cal.setTime(date);
	                           return cal.getActualMaximum(Calendar.DATE);
	                       }	
	                            /**
	                             * 獲取日期時(shí)間當(dāng)年的總天數(shù)，如2017-02-13，返回2017年的總天數(shù)
	                             * @param date
	                             * @return
	                             */
	                            public static int getDaysOfYear(Date date) {  
	                                Calendar cal = Calendar.getInstance();  
	                                cal.setTime(date);
	                                return cal.getActualMaximum(Calendar.DAY_OF_YEAR);
	                            }
	                            /**
	                             * 根據(jù)時(shí)間獲取當(dāng)月最大的日期
	                             * <li>2017-02-13，返回2017-02-28</li>
	                             * <li>2016-02-13，返回2016-02-29</li>
	                             * <li>2016-01-11，返回2016-01-31</li>
	                             * @param date Date
	                             * @return
	                             * @throws Exception 
	                             */
	                            public static Date maxDateOfMonth(Date date) throws Exception {
	                                Calendar cal = Calendar.getInstance();  
	                                cal.setTime(date);
	                                int value = cal.getActualMaximum(Calendar.DATE);
	                                return dateParse(dateFormat(date, MONTH_PATTERN) + "-" + value, null);
	                            }
	                            /**
	                             * 根據(jù)時(shí)間獲取當(dāng)月最小的日期，也就是返回當(dāng)月的1號(hào)日期對(duì)象
	                             * @param date Date
	                             * @return
	                             * @throws Exception 
	                             */
	                            public static Date minDateOfMonth(Date date) throws Exception {
	                                Calendar cal = Calendar.getInstance();  
	                                cal.setTime(date);
	                                int value = cal.getActualMinimum(Calendar.DATE);
	                                return dateParse(dateFormat(date, MONTH_PATTERN) + "-" + value, null);	                       
}
}
   public static void main(String[] args) throws Exception {
	           System.out.println(dateTimeToDate(new Date()));
	           System.out.println(dateParse("2017-02-04 14:58:20", null));
	           System.out.println(dateTimeToDateStringIfTimeEndZero(new Date()));
	           System.out.println(dateTimeToDateStringIfTimeEndZero(dateTimeToDate(new Date())));
	           System.out.println(dateBetween(dateParse("2017-01-30", null), dateParse("2017-02-01", null)));
	           System.out.println(dateBetweenIncludeToday(dateParse("2017-01-30", null), dateParse("2017-02-01", null)));
	           System.out.println(getDate(dateParse("2017-01-17", null)));
	           System.out.println(getDaysOfMonth(dateParse("2017-02-01", null)));
	           System.out.println(getDaysOfYear(dateParse("2017-01-30", null)));
	        /*   System.out.println(dateFormat(dateAddMonths(dateParse("2017-02-07", StrUtils.MONTH_PATTERN), -12), StrUtils.MONTH_PATTERN));*/
	           System.out.println(dateFormat(maxDateOfMonth(dateParse("2016-02", "yyyy-MM")), null));
	           System.out.println(dateFormat(minDateOfMonth(dateParse("2016-03-31", null)), null));
	}

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