前端js求两个时间的天数差 后端日期处理

//+---------------------------------------------------
//| 求两个时间的天数差 日期格式为 YYYY-MM-dd
//+---------------------------------------------------
function daysBetween(DateOne,DateTwo)
{
    var OneMonth = DateOne.substring(5,DateOne.lastIndexOf ('-'));
    var OneDay = DateOne.substring(DateOne.length,DateOne.lastIndexOf ('-')+1);
    var OneYear = DateOne.substring(0,DateOne.indexOf ('-'));

    var TwoMonth = DateTwo.substring(5,DateTwo.lastIndexOf ('-'));
    var TwoDay = DateTwo.substring(DateTwo.length,DateTwo.lastIndexOf ('-')+1);
    var TwoYear = DateTwo.substring(0,DateTwo.indexOf ('-'));

    var cha=((Date.parse(OneMonth+'/'+OneDay+'/'+OneYear)- Date.parse(TwoMonth+'/'+TwoDay+'/'+TwoYear))/86400000);
    return Math.abs(cha);
}

//日期加减法  date参数为计算开始的日期，days为需要加的天数
//格式:addDate('2018-1-11',20)
function addDate(date,days){
    var d=new Date(date);
    d.setDate(d.getDate()-days);
    var m=d.getMonth()+1;
    return d.getFullYear()+'-'+m+'-'+d.getDate();
}

 

 

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package com.jianxing.utils;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/** 
 * 说明：日期处理
 * @version
 */
public class DateUtil {
   
   private final static SimpleDateFormat sdfYear = new SimpleDateFormat("yyyy");
   private final static SimpleDateFormat sdfDay = new SimpleDateFormat("yyyy-MM-dd");
   private final static SimpleDateFormat sdfDays = new SimpleDateFormat("yyyyMMdd");
   private final static SimpleDateFormat sdfTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
   private final static SimpleDateFormat sdfTimes = new SimpleDateFormat("yyyyMMddHHmmss");

   /**
    * 获取YYYY格式
    * @return
    */
   public static String getSdfTimes() {
      return sdfTimes.format(new Date());
   }
   
   /**
    * 获取YYYY格式
    * @return
    */
   public static String getYear() {
      return sdfYear.format(new Date());
   }

   /**
    * 获取YYYY-MM-DD格式
    * @return
    */
   public static String getDay() {
      return sdfDay.format(new Date());
   }
   
   /**
    * 获取YYYYMMDD格式
    * @return
    */
   public static String getDays(){
      return sdfDays.format(new Date());
   }

   /**
    * 获取YYYY-MM-DD HH:mm:ss格式
    * @return
    */
   public static String getTime() {
      return sdfTime.format(new Date());
   }

   /**
   * @Title: compareDate
   * @Description: TODO(日期比较，如果s>=e 返回true 否则返回false)
   * @param s
   * @param e
   * @return boolean  
   * @throws
   * @author fh
    */
   public static boolean compareDate(String s, String e) {
      if(fomatDate(s)==null||fomatDate(e)==null){
         return false;
      }
      return fomatDate(s).getTime() >=fomatDate(e).getTime();
   }

   /**
    * 格式化日期
    * @return
    */
   public static Date fomatDate(String date) {
      DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
      try {
         return fmt.parse(date);
      } catch (ParseException e) {
         e.printStackTrace();
         return null;
      }
   }

   /**
    * 校验日期是否合法
    * @return
    */
   public static boolean isValidDate(String s) {
      DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
      try {
         fmt.parse(s);
         return true;
      } catch (Exception e) {
         // 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
         return false;
      }
   }
   
   /**
    * 年数差
    * @param startTime
    * @param endTime
    * @return
    */
   public static int getDiffYear(String startTime,String endTime) {
      DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
      try {
         //long aa=0;
         int years=(int) (((fmt.parse(endTime).getTime()-fmt.parse(startTime).getTime())/ (1000 * 60 * 60 * 24))/365);
         return years;
      } catch (Exception e) {
         // 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
         return 0;
      }
   }
    
   /**
     * 
功能描述：时间相减得到天数
     * @param beginDateStr
     * @param endDateStr
     * @return
     * long 
     * @author Administrator
     */
    public static long getDaySub(String beginDateStr,String endDateStr){
        long day=0;
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Date beginDate = null;
        Date endDate = null;
        
            try {
            beginDate = format.parse(beginDateStr);
            endDate= format.parse(endDateStr);
         } catch (ParseException e) {
            e.printStackTrace();
         }
            day=(endDate.getTime()-beginDate.getTime())/(24*60*60*1000);
            //System.out.println("相隔的天数="+day);
      
        return day;
    }
    
    /**
     * 得到n天之后的日期
     * @param days
     * @return
     */
    public static String getAfterDayDate(String days) {
       int daysInt = Integer.parseInt(days);
       
        Calendar canlendar = Calendar.getInstance(); // java.util包
        canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
        Date date = canlendar.getTime();
        
        SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd");
        String dateStr = sdfd.format(date);
        
        return dateStr;
    }
    
    /**
     * 得到n天之后是周几
     * @param days
     * @return
     */
    public static String getAfterDayWeek(String days) {
       int daysInt = Integer.parseInt(days);
        Calendar canlendar = Calendar.getInstance(); // java.util包
        canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
        Date date = canlendar.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("E");
        String dateStr = sdf.format(date);
        return dateStr;
    }

    public static void main(String[] args) {
       //System.out.println(getDays());
       //System.out.println(getAfterDayWeek("3"));
        //System.out.println(getAfterDayDate("-1"));
      //System.out.println(getDiffYear("2018-11-19","2118-11-19"));
      //System.out.println(isValidDate("2018/11/19"));

    }

}