Java determines the number of days between two time differences!

package com.datedaycha;    import java.text.simpledateformat;     import java.util.Calendar;    import java.util.Date;     import com.sun.org.apache.xerces.internal.impl.xpath.regex.parseexception;    / *     * java  determine the number of days between two time differences     1, achieve goals       Input: Two dates      outputs: Two days of difference     2, code implementation      Method 1:      date comparison by Calendar class. Note: It is important to consider that the:     date is a cross-year, such as a 2012, a 2015          Year is a leap year of peace years, the respective days are different      */    public class date_day_cha1  {    /** Method 1         *  Date2 more than date1 days          *  @param  date1             *  @param  date2          *  @return               */    public static int differentdays_one (Date &NBSP;DATE1,DATE&NBSP;DATE2)     {    Calendar cal1 =  Calendar.getinstance ();     cal1.settime (date1);     calendar cal2  = calendar.getinstance ();     cal2.settime (date2);     int  day1= cal1.get (calendar.day_of_year);     int day2 = cal2.get ( Calendar.day_of_year);     int year1 = cal1.get (Calendar.YEAR);     int year2 = cal2.get (calendar.year);     //Add time date size   judgment    tube Him who big who small   &Nbsp; int diff ;    if (day1<day2)  {    diff  = day2 - day1;    } else {    diff  = day1 - day2;    }    if (year1 !=  YEAR2)   //different years     {    int timedistance = 0  ;    for (int i = year1 ; i < year2 ;  i ++)     {    if (i%4==0 && i%100!=0  ||  i%400==0)     //leap year                  {    timedistance += 366;    }     else    //not leap year     {     Timedistance += 365;    }    }    //return timedistance +  (day2-day1)  ;    return timeDistance + diff ;     }    else     //same year     {     //            system.out.println (" Judge day2 - day1 :  " +  (day2-day1));    //             return day2-day1;            system.out.println ("Judging day2 - day1 : "  + diff );    return diff;    }    }     /* directly by calculating the number of milliseconds of two dates, dividing their difference by the number of milliseconds in a day, we can get the number of days that we want to differ by the two dates. */    /**             *  two-time interval by time-second-millisecond number               *  @param  date1              *  @param  date2              *  @return              */     public static int differentdaysbymillisecond (Date date1,Date  DATE2)     {           //Add a time date size   Judging    Tube He who big who small            long time1  = date1.gettime ();     long time2 = date2.gettime ();     long diff ;    if (time1<time2)  {    diff  = time2 - time1;    } else {    diff = time1 -  time2;    }    //int days =  (int)   (Date2.getTime ( )  - date1.gettime ())  /  (1000*3600*24));    int days =  ( int)   (diff /(1000*3600*24));    return days;    }     //Test     public static void main (String[] args)   throws exception {           string  datestr =  "2017-1-1 0:0:0";    string datestr2 =  "2017-9-14  10:57:01 ";     simpledateformat format = new simpledateformat (" Yyyy-mm-dd hh:mm:ss ");     //   simpledateformat format2 =  new simpleDateFormat ("Yyyy-mm-dd hh:mm:ss");    try     {     date date2 = format.parse (DATESTR2);     date date =  format.parse (DATESTR);     system.out.println ("Two-date gap   Method 1:"  +  Differentdays_one (Date,date2));     system.out.println ("Two-date gap   Method 2:"  +  Differentdaysbymillisecond (Date,date2));     date d=new date ();     system.out.println (D.gettime ());     system.out.println ("Distance today-two dates gap   Method 1:"  + differentdays_one (Date,d));     system.out.println ("Distance today-two dates gap   Method 2:"  + differentdaysbymillisecond (d,date));    } catch  (ParseException  e)  {    e.printstacktrace ();     }    }     }  Method 2: 

package com.datedaycha;    import java.text.dateformat;     import java.text.simpledateformat;    import java.util.date;     import com.sun.org.apache.xerces.internal.impl.xpath.regex.parseexception;    / **     *  time distance      *  @author  LC     *  @version  1.0     *  @date  2017-9-14 10:59:04     */     public class date_day_cha2 {     /**          *  two time difference between days            *  @param  one  Time Parameters  1:           *  @param  two  Time Parameters  2:           *  @return   Difference days           */       public static long getdistancedays (string str1, string  STR2)  throws Exception{    DateFormat df = new  SimpleDateFormat ("Yyyy-mm-dd");    date one;    date two;     long days=0;    try {    one =  df.parse (STR1);     two = df.parse (STR2);    long  Time1 = one.gettime ();     long time2 = two.gettime ();     long diff ;    if (time1<time2)  {    diff  = time2 - time1;    } else {    diff  = time1 - time2;    }    days = diff /  (1000 * 60  * 60 * 24);    } catch  (parseexception e)  {     e.printstacktrace ();    }    return days;     }    /**          *  Two time difference between how many days how many hours how many seconds           *  @param  str1  Time Parameters  1  Format: 1990-01-01 12:00:00          *   @param  str2  Time Parameters  2  format:2009-01-01 12:00:00           *  @return  long[]  return value: {days, , ,  seconds}           *  @throws  Exception           */&Nbsp;     public static long[] getdistancetimes (STRING&NBSP;STR1, &NBSP;STRING&NBSP;STR2)  throws exception {    dateformat df =  new simpledateformat ("Yyyy-mm-dd hh:mm:ss");    date one;     date two;    long day = 0;    long  hour = 0;    long min = 0;    long  sec = 0;    try {    one = df.parse ( STR1);     two = df.parse (str2);     long time1 =  one.gettime ();     long time2 = two.gettime ();     Long diff ;    if (time1<time2)  {    diff =  time2 - time1;    } else {    diff = time1 - time2;     }    day = diff /  (24 * 60 * 60 *  1000);    hour =  (diff /  (60 * 60 * 1000)  - day * 24);    min =  ((diff /  (60 *  ())  - day * 24 * 60 - hour * 60);     sec =  (diff/1000-day*24*60*60-hour*60*60-min*60);    } catch  ( parseexception e)  {    e.printstacktrace ();    }     long[] times = {day, hour, min, sec};    return  times;    }    /**           *  two X hoursDistance between the days how many hours how many minutes how many seconds           *  @param  str1  Time Parameters  1  Format: 1990-01-01 12:00:00          *   @param  str2  Time Parameters  2  format:2009-01-01 12:00:00           *  @return  String  return value: xx days xx hours xx minutes xx seconds            *  @throws  Exception           */      public static string getdistancetime (String  STR1,&NBSP;STRING&NBSP;STR2)  throws Exception {    DateFormat df  = new simpledateformat ("Yyyy-mm-dd hh:mm:ss");    date one;     Date two;    long day = 0;     Long hour = 0;    long min = 0;    long sec = 0;     try {    one = df.parse (STR1);     two  = df.parse (STR2);     long time1 = one.gettime ();     long time2 = two.gettime ();    long diff ;     if (time1<time2)  {    diff = time2 - time1;     } else {    diff = time1 - time2;     }    day = diff /  (24 * 60 *  60 * 1000);    hour =  (diff /  (60 * 60  * 1000)  - day * 24);    min =  ((diff /  (60  * 1000))  - dAY&NBSP;*&NBSP;24&NBSP;*&NBSP;60&NBSP;-&NBSP;HOUR&NBSP;*&NBSP;60);    sec =  ( diff/1000-day*24*60*60-hour*60*60-min*60);    } catch  (ParseException e)  {    e.printstacktrace ();     }    return  day +  "Days"  + hour +  "hours"  + min +  "Minutes"  + sec  +  "seconds";     }    //test     public  Static void main (String[] args)  throws Exception {        String dateStr =  "2008-1-1 1:21:28";    string  datestr2 =  "2017-9-14 10:57:01";     long days=getdistancedays (DATESTR, &NBSP;DATESTR2);     long[] longdays2;    longdays2= Getdistancetimes (DATESTR,&NBSP;DATESTR2);    string stringday3=  getdistancetime (DATESTR,&NBSP;DATESTR2);     system.out.println ("Return value returns: How many days difference:" +days);     system.out.println (" Return value return:long[]  return value: {Day, ,  minutes,  seconds}----: "+longdays2[0]+" Days "+longdays2[1]+" hours "+longdays2[2]+" +longdays2[3]+ "Seconds")     system.out.println ("Return value return:string  return value: xx days xx hours xx minutes xx seconds  -----: "+stringday3);     }    }

Java determines the number of days between two time differences!