How to calculate time difference in java

Question

I want to subtract two timeperiods say 16 00 00 from 19 00 00  Is there any java function for this  The results can be in milliseconds  seconds  or minutes

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import java util Date      Date d1   new Date            Date d2   new Date    System out println d2 getTime  -d1 getTime       gives the time difference in milliseconds   System out println  d2 getTime  -d1 getTime    1000     gives the time difference in seconds    and  to show in a nicer format  you can use       DecimalFormat myDecimalFormatter   new DecimalFormat                     System out println myDecimalFormatter format   double d2 getTime  -d1 getTime    1000

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String time1    16 00 00   String time2    19 00 00    SimpleDateFormat format   new SimpleDateFormat  HH mm ss    Date date1   format parse time1   Date date2   format parse time2   long difference   date2 getTime   - date1 getTime       Difference is in milliseconds   I modified sfaizs post

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Just like any other language  convert your time periods to a unix timestamp  ie  seconds since the Unix epoch  and then simply subtract  Then  the resulting seconds should be used as a new unix timestamp and read formatted in whatever format you want   Ah  give the above poster  genesiss  his due credit  code s always handy    Though  you now have an explanation as well

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import java text SimpleDateFormat  import java util Date  public class Main   public static void main String   args  throws Exception      String time1    12 00 00       String time2    12 01 00       SimpleDateFormat format   new SimpleDateFormat  HH mm ss        Date date1   format parse time1       Date date2   format parse time2       long difference   date2 getTime   - date1 getTime        System out println difference 1000        throws exception handles parsing exceptions

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TO get pretty timing differences  then      d1  d2 are dates long diff   d2 getTime   - d1 getTime     long diffSeconds   diff   1000   60  long diffMinutes   diff    60   1000    60  long diffHours   diff    60   60   1000    24  long diffDays   diff    24   60   60   1000    System out print diffDays     days      System out print diffHours     hours      System out print diffMinutes     minutes      System out print diffSeconds     seconds

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import java sql     class Time3        public static void main String args              String time1    01 03 23           String time2    02 32 00           long difference           Time t1   Time valueOf time1           Time t2   Time valueOf time2           if t2 getTime    gt   t1 getTime                 difference   t2 getTime   - t1 getTime   -19800000                    else              difference   t1 getTime   - t2 getTime   -19800000                     java sql Time time   new java sql Time difference            System out println time

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The painful way is to convert to millis and do the subtraction and then back to whatever seconds or so you want  The better way is to use JodaTime

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Java 8 has a cleaner solution - Instant and Duration  Example   import java time Duration  import java time Instant      Instant start   Instant now      your code Instant end   Instant now    Duration timeElapsed   Duration between start  end   System out println  Time taken     timeElapsed toMillis      milliseconds

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Total time calculation      private void getTotalHours         try              TODO Auto-generated method stub         if  tfTimeIn getValue      null  amp  amp  tfTimeOut getValue      null                Long min1   tfTimeOut getMinutesValue                Long min2   tfTimeIn getMinutesValue                Long hr1   tfTimeOut getHoursValue                Long hr2   tfTimeIn getHoursValue                Long hrsTotal   new Long  0                Long minTotal   new Long  0                if   hr2 - hr1     1                    hrsTotal    long  1                  if  min1    0  amp  amp  min2    0                        minTotal    long  60 - min1                    else if  min1    0  amp  amp  min2    0                        minTotal   min2                    else if  min1    0  amp  amp  min2    0                        minTotal   min2                      Long minOne    long  60 - min1                      Long minTwo   min2                      minTotal   minOne   minTwo                                    if  minTotal  gt   60                        hrsTotal                        minTotal   minTotal   60                                  else if   hr2 - hr1   gt  0                    hrsTotal    hr2 - hr1                   if  min1    0  amp  amp  min2    0                        minTotal    long  60 - min1                    else if  min1    0  amp  amp  min2    0                        minTotal   min2                    else if  min1    0  amp  amp  min2    0                        minTotal   min2                      Long minOne    long  60 - min1                      Long minTwo   min2                      minTotal   minOne   minTwo                                    if  minTotal  gt   60                        minTotal   minTotal   60                                  else if   hr2 - hr1     0                    if  min1    0    min2    0                        if  min2  gt  min1                            hrsTotal    long  0                          minTotal   min2 - min1                        else                           Notification show  Enter A Valid Time                            tfTotalTime setValue  00 00                                                          else                   Notification show  Enter A Valid Time                    tfTotalTime setValue  00 00                              String hrsTotalString   hrsTotal toString                String minTotalString   minTotal toString                if  hrsTotalString trim   length      1                    hrsTotalString    0    hrsTotalString                            if  minTotalString trim   length      1                    minTotalString    0    minTotalString                            tfTotalTime setValue hrsTotalString         minTotalString             else               tfTotalTime setValue  00 00                        catch  Exception e            e printStackTrace

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Try this   public String timeDifference8 String startTime  String endTime        LocalTime initialTime   LocalTime parse startTime       LocalTime finalTime  LocalTime parse endTime       StringJoiner joiner   new StringJoiner           long hours   initialTime until  finalTime  ChronoUnit HOURS       initialTime   initialTime plusHours  hours        long minutes   initialTime until finalTime  ChronoUnit MINUTES       initialTime   initialTime plusMinutes  minutes        long seconds   initialTime until  finalTime  ChronoUnit SECONDS       joiner add String valueOf hours        joiner add String valueOf minutes        joiner add String valueOf seconds        return joiner toString

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Java 8  DateTimeFormatter formatter   DateTimeFormatter ofPattern  yyyy-MM-dd HH mm ss     LocalDateTime dateTime1  LocalDateTime parse  2014-11-25 19 00 00   formatter   LocalDateTime dateTime2  LocalDateTime parse  2014-11-25 16 00 00   formatter    long diffInMilli   java time Duration between dateTime1  dateTime2  toMillis    long diffInSeconds   java time Duration between dateTime1  dateTime2  getSeconds    long diffInMinutes   java time Duration between dateTime1  dateTime2  toMinutes

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public class timeDifference    public static void main String   args         try            Date startTime   Calendar getInstance   getTime            Thread sleep 10000           Date endTime   Calendar getInstance   getTime             long difference   endTime getTime   - startTime getTime             long differenceSeconds   difference   1000   60          long differenceMinutes   difference    60   1000    60          long differenceHours   difference    60   60   1000    24          long differenceDays   difference    24   60   60   1000            System out println differenceDays     days              System out println differenceHours     hours              System out println differenceMinutes     minutes              System out println differenceSeconds     seconds            catch  Exception e            e printStackTrace

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class TimeCalculator       String updateTime        public TimeCalculator String time                     time should be in 24 hours format like 15 06 2016 17 39 20           this updateTime   time                public String getTimeDifference                  String td null            get Current Time         SimpleDateFormat sdf   new SimpleDateFormat  dd MM yyyy hh mm ss            Date currentDate   new Date            Calendar calendar   new GregorianCalendar            calendar setTime currentDate            int c year   calendar get Calendar YEAR           int c month   calendar get Calendar MONTH    1          int c day   calendar get Calendar DAY OF MONTH               get Editing Time          Date edit date   sdf parse updateTime           Calendar edit calendar   new GregorianCalendar            edit calendar setTime edit date            int e year   edit calendar get Calendar YEAR           int e month   edit calendar get Calendar MONTH    1          int e day   edit calendar get Calendar DAY OF MONTH             if e year  c year amp  amp e month  c month amp  amp e day  c day                              int c hours   calendar get Calendar HOUR OF DAY                int c minutes   calendar get Calendar MINUTE                int c seconds   calendar get Calendar SECOND                 int e hours   edit calendar get Calendar HOUR OF DAY                int e minutes   edit calendar get Calendar MINUTE                int e seconds   edit calendar get Calendar SECOND          if c hours  e hours amp  amp c minutes  e minutes amp  amp c seconds  e seconds                        td    just now              return td                    else if c hours  e hours amp  amp c minutes  e minutes                    int d seconds   c seconds-e seconds           td   String valueOf d seconds            td   td   seconds ago            return td                 else if c hours  e hours amp  amp c minutes  e minutes                    int d minutes   c minutes-e minutes           int d seconds           if c seconds gt e seconds                            d seconds   c seconds-e seconds              else               d seconds   e seconds-c seconds                     td    00   String valueOf d minutes      String valueOf d seconds    ago           return td          else                  int d minutes d seconds d hours          d hours c hours-e hours          if c minutes gt e minutes                    d minutes   c minutes-e minutes          else           d minutes   e minutes-c minutes                   if c seconds gt e seconds                          d seconds   c seconds-e seconds             else              d seconds   e seconds-c seconds                     td   String valueOf d hours      String valueOf d minutes      String valueOf d seconds    ago        return td         else if e year  c year amp  amp e month  c month amp  amp c day  e day 1      td    yesterday      return td      else      td   updateTime      return td

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I found this more cleaner          Date start   new Date              Waiting for 10 seconds         Thread sleep 10000           Date end   new Date            long diff   end getTime   - start getTime            String TimeTaken   String format    s  hours     s  mins     s  secs                   Long toString TimeUnit MILLISECONDS toHours diff                     TimeUnit MILLISECONDS toMinutes diff                   TimeUnit MILLISECONDS toSeconds diff            System out println String format  Time taken  s   TimeTaken         Output   Time taken  0  hours    0  mins    10  secs

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lternative option if time from different days is taken  for example  22 00 and 01 55   public static long getDiffTime Date date1  Date date2           if  date2 getTime   - date1 getTime    lt  0      if for example date1   22 00  date2   01 55              Calendar c   Calendar getInstance                c setTime date2               c add Calendar DATE  1               date2   c getTime                else for example date1   01 55  date2   03 55          long ms   date2 getTime   - date1 getTime               235 minutes   4 hours for  22 00 -- 01 55             120 minutes   2 hours for  01 55 -- 03 55           return TimeUnit MINUTES convert ms  TimeUnit MILLISECONDS

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String start    12 00 00   String end    02 05 00    SimpleDateFormat format   new SimpleDateFormat  HH mm ss      Date date1   format parse start    Date date2   format parse end    long difference   date2 getTime   - date1 getTime      int minutes    int  TimeUnit MILLISECONDS toMinutes difference    if minutes lt 0 minutes    1440     Now minutes will be the correct duration between two time  in minute

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Besides the most common approach with Period and Duration objects you can widen your knowledge with another way for dealing with time in Java   Advanced Java 8 libraries  ChronoUnit for Differences   ChronoUnit is a great way to determine how far apart two Temporal values are  Temporal includes LocalDate  LocalTime and so on   LocalTime one   LocalTime of 5 15   LocalTime two   LocalTime of 6 30   LocalDate date   LocalDate of 2019  1  29    System out println ChronoUnit HOURS between one  two      1 System out println ChronoUnit MINUTES between one  two      75 System out println ChronoUnit MINUTES between one  date      DateTimeException   First example shows that between truncates rather than rounds   The second shows how easy it is to count different units   And the last example reminds us that we should not mess up with dates and times in Java

[java] How to calculate time difference in java?

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