关于Java日期工具类的编写

目录

• Java日期工具类编写
• JavaCalendar日历类的时间操作
• 日期工具类

Java日期工具类编写

将字符串转换为对应日期

Date date = simpleDateFormat.parse(string);  

将日期转换为字符串

String string = simpleDateFormat.format(date);  

注意，因为可能定义的格式和实际字符串提供的格式不符合，所以会抛出异常。

将年月日的汉字日期转为 - - 分隔符的日期

public static void main(String[] args) throws ParseException {
		//统一日期格式
		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);
	}

    /**
     * 将日期对象格式化为指定格式的日期字符串
     * @param date 传入的日期对象
     * @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;
    }
    /**
     * 将日期字符串转换成一个日期对象 
     * @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时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"));
    }

运行输出：

2016-11-02

2016-11-02 18:06:50

2016年11月02日18时06分50秒

1989-11-02 18:01:41

SimpleDateFormat类主要是用作日期类型转换用的，常用的日期格式化

    public static void main(String[] args) {
        //默认输出格式
        Date date=new Date();
        System.out.println(date);
        //日期格式化显示，首先定义格式
        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时mm分ss秒");
        //将格式应用于日期
        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日历类的时间操作

Calendar有个DAY_OF_WEEK 可以返回一个星期中的第几天；

这里说下注意点 老外的第一天是从星期日开始的，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]);
    }
}

对日历进行操作

    public static void main(String[] args) {
        //默认输出格式
    	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());
    UsQnQx	System.out.println(nowTime2);
    }

获取时间

赋值时年月日时分秒常用的6个值，注意月份下标从0开始，所以取月份要+1

 开发者_Go培训   public static void main(String[] args) {
        //默认输出格式
    	Date now = new Date();
    	SimpleDateFormat nowSdf = new SimpleDateFormat("yyyy-MM-dd");
        System.out.println(nowSdf.format(now));
        Calendar calendar = Calendar.getInstance();
        // 赋值时年月日时分秒常用的6个值，注意月份下标从0开始，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("时:" + 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);
    }

设置时间 

如果想设置为某个日期，可以一次设置年月日时分秒，由于月份下标从0开始赋值月份要-1

    public static void main(String[] args) {
        //默认输出格式
    	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);//时 
        calendar.set(Calendar.MINUTE, 33);//分 
        calendar.set(Calendar.SECOND, 32);//秒 
    }

时间计算

    public static void main(String[] args) {
        //默认输出格式
    	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.a编程客栈dd(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);// 本周几  
    	calendar.add(Calendar.HOUR_OF_DAY, -1);//时 
    	calendar.add(Calendar.MINUTE, 1);//分 
    	calendar.add(Calendar.SECOND, 1);//秒 
        //calendar.add(calendar.WEEK_OF_MONTH, 1);//增加一个礼拜
        //calendar.add(calendar.WEEK_OF_YEAR,1);//增加一个礼拜
       	SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    	String nowTime1 = sdf1.format(calendar.getTime());
    	System.out.println(nowTime1);
    }

日期的计算

获取本月最小天数与最大天数

    public static void main(String[] args) {
        //默认输出格式
    	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("获取本月的第一天和最后天：" + firstD +"," + lastD);
    }

获取本周星期一、上周星期一、这周星期一

    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);
        // 获得当前日期是一个星期的第几天
        int dayWeek = cal.get(Calendar.DAY_OF_WEEK);
        if (1 == dayWeek) {
            cal.add(Calendar.DAY_OF_MONTH, -1);
        }
        // 设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
        cal.setFirstDayOfWeek(Calendar.MONDAY);
        // 获得当前日期是一个星期的第几天
        int day = cal.get(Calendar.DAY_OF_WEEK);
        // 根据日历的规则，给当前日期减去星期几与一个星期第一天的差值
        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();
        }
    }

天数计算

用Date类计算日期差

public static void main(String[] args) {
	 Calendar love = Calendar.getInstance();  
     Calendar now = Calendar.getInstance();  
     love.set(2016, 8, 6); //真实的日期是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");//大小写还是很重要的
	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);
}

日期工具类

 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";
	          /**
	           * 日期相加减天数
	           * @param date 如果为Null，则为当前时间
	           * @param days 加减天数
	           * @param includeTime 是否包括时分秒,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();
	          }
	          /**
	           * 时间格式化成字符串
	           * @param date Date
	           * @param pattern StrUtils.DATE_TIME_PATTERN || StrUtils.DATE_PATTERN， 如果为空，则为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);
	          }
	          /**
	           * 字符串解析成时间对象
	           * @param dateTimeString String
	           * @param pattern StrUtils.DATE_TIME_PATTERN || StrUtils.DATE_PATTERN，如果为空，则为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);
	          }
	          /**
	           * 将日期时间格式成只有日期的字符串（可以直接使用dateFormat，Pattern为Null进行格式化）
	           * @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); 
	          }
	             /**
	              * 当时、分、秒为00:00:00时，将日期时间格式成只有日期的字符串，
	              * 当时、分、秒不为00:00:00时，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;
	                 }
	             }
	             /**
	              * 将日期时间格式成日期对象，和dateParse互用
	              * @ppythonaram 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();
	             }
	             /** 
	              * 时间加减小时
	              * @param startDate 要处理的时间，Null则为当前时间 
	              * @param hours 加减的小时 
	              * @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();  
	             }
	             /**
	              * 时间加减分钟
	              * @param startDate 要处理的时间，Null则为当前时间 
	              * @param minutes 加减的分钟
	              * @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();  
	             }
	             /**
	              * 时间加减秒数
	              * @param startDate 要处理的时间，Null则为当前时间 
	              * @param minutes 加减的秒数
	              * @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();  
	               }	          
	                  /** 
	                   * 时间加减天数 
	                   * @param startDate 要处理的时间，Null则为当前时间 
	                   * @param days 加减的天数 
	                   * @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();  
	                  }
	                  /** 
	                   * 时间加减月数
	                   * @param startDate 要处理的时间，Null则为当前时间 
	                   * @param months 加减的月数 
	                   * @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();  
	                  }
	                  /** 
	                   * 时间加减年数
	                   * @param startDate 要处理的时间，Null则为当前时间 
	                   * @param years 加减的年数 
	                   * @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();  
	                  }  
	                  /** 
	                   * 时间比较（如果myDate>compareDate返回1，<返回-1，相等返回0） 
	                   * @param myDate 时间 
	                   * @param compareDate 要比较的时间 
	                   * @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);  
	                  }
	                       /**
	                        * 获取两个时间中最小的一个时间
	                        * @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;  
	                       }
	                       /**
	                        * 获取两个时间中最大的一个时间
	               编程客栈         * @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;  
	                       }
	                       /**
	                        * 获取两个日期（不含时分秒）相差的天数，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); 
	                       }
	                       /**
	                        * 获取两个日期（不含时分秒）相差的天数，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;
	                       }
	                       /**
	                        * 获取日期时间的年份，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);
	                       }
	                       /**
	                        * 获取日期时间的月份，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;
	                       }
	                       /**
	                        * 获取日期时间的第几天（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);
	                       }
	                       /**
	                        * 获取日期时间当月的总天数，如2017-02-13，返回28
	                        * @param date
	                        * @return
	                        */
	                       public static int getDaysOfMonth(Date date) {  
	                           www.devze.comCalendar cal = Calendar.getInstance();  
	                           cal.setTime(date);
	                           return cal.getActualMaximum(Calendar.DATE);
	                       }	
	                            /**
	                             * 获取日期时间当年的总天数，如2017-02-13，返回2017年的总天数
	                             * @param date
	                             * @return
	                             */
	                            public static int getDaysOfYear(Date date) {  
	                                Calendar cal = Calendar.getInstance();  
	                                cal.setTime(date);
	                                return cal.getActualMaximum(Calendar.DAY_OF_YEAR);
	                            }
	                            /**
	                             * 根据时间获取当月最大的日期
	                             * <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);
	                            }
	                            /**
	                             * 根据时间获取当月最小的日期，也就是返回当月的1号日期对象
	                             * @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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