Calculate date time difference in java

Question

I want to calculate difference between 2 dates in hours minutes seconds    I have a slight problem with my code here it is    String dateStart    11 03 14 09 29 58   String dateStop    11 03 14 09 33 43       Custom date format SimpleDateFormat format   new SimpleDateFormat  yy MM dd HH mm ss       Date d1   null  Date d2   null  try       d1   format parse dateStart       d2   format parse dateStop     catch  ParseException e        e printStackTrace              Get msec from each  and subtract  long diff   d2 getTime   - d1 getTime    long diffSeconds   diff   1000           long diffMinutes   diff    60   1000            long diffHours   diff    60   60   1000                         System out println  Time in seconds      diffSeconds     seconds              System out println  Time in minutes      diffMinutes     minutes              System out println  Time in hours      diffHours     hours        This should produce    Time in seconds  45 seconds  Time in minutes  3 minutes  Time in hours  0 hours    However I get this result    Time in seconds  225 seconds  Time in minutes  3 minutes  Time in hours  0 hours    Can anyone see what I m doing wrong here

User · Answer

Joda-Time  Joda-Time 2 3 library offers already-debugged code for this chore   Joad-Time includes three classes to represent a span of time  Period  Interval  and Duration  Period tracks a span as a number of months  days  hours  etc   not tied to the timeline          2013 Basil Bourque  This source code may be used freely forever by anyone taking full responsibility for doing so      Specify a time zone rather than rely on default     Necessary to handle Daylight Saving Time  DST  and other anomalies  DateTimeZone timeZone   DateTimeZone forID   America Montreal      DateTimeFormatter formatter   DateTimeFormat forPattern   yy MM dd HH mm ss    withZone  timeZone      DateTime dateTimeStart   formatter parseDateTime   11 03 14 09 29 58     DateTime dateTimeStop   formatter parseDateTime   11 03 14 09 33 43     Period period   new Period  dateTimeStart  dateTimeStop     PeriodFormatter periodFormatter   PeriodFormat getDefault    String output   periodFormatter print  period     System out println   output      output      When run     output  3 minutes and 45 seconds

User · Answer

If you are able to use external libraries I would recommend you to use Joda-Time  noting that      Joda-Time is the de facto standard date and time library for Java prior to Java SE 8  Users are now asked to migrate to java time  JSR-310     Example for between calculation   Seconds between startDate  endDate   Days between startDate  endDate

User · Answer

Create a Date object using the diffence between your times as a constructor   then use Calendar methods to get values     Date diff   new Date d2 getTime   - d1 getTime      Calendar calendar   Calendar getInstance    calendar setTime diff   int hours   calendar get Calendar HOUR OF DAY   int minutes   calendar get Calendar MINUTE   int seconds   calendar get Calendar SECOND

User · Answer

Date startTime   new Date                lengthy jobs       Date endTime   new Date    long diff   endTime getTime   - startTime getTime    String hrDateText   DurationFormatUtils formatDuration diff   d  day s   H  hour s   m  minute s   s  second s       System out println  Duration       hrDateText     You can use Apache Commons Duration Format Utils  It formats like SimpleDateFormatter  Output  0 days s  0 hour s  0 minute s  1 second s

User · Answer

try  long diffSeconds   diff   1000   60    long diffMinutes   diff    60   1000    60   long diffHours   diff    60   60   1000     NOTE  this assumes that diff is non-negative

User · Answer

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

User · Answer

Well  I ll try yet another code sample          Calculates the number of FULL days between to dates     param startDate must be before endDate     param endDate must be after startDate     return number of day between startDate and endDate     public static int daysBetween Calendar startDate  Calendar endDate        long start   startDate getTimeInMillis        long end   endDate getTimeInMillis           It s only approximation due to several bugs   see java util Date  and different precision in Calendar chosen        by user  ex  day is time-quantum       int presumedDays    int  TimeUnit MILLISECONDS toDays end - start       startDate add Calendar DAY OF MONTH  presumedDays          if we still didn t reach endDate try it with the step of one day     if  startDate before endDate             startDate add Calendar DAY OF MONTH  1             presumedDays               if we crossed endDate then we must go back  because the boundary day haven t completed yet     if  startDate after endDate             --presumedDays            return presumedDays

User · Answer

I know this is an old question  but I ended up doing something slightly different from the accepted answer  People talk about the TimeUnit class  but there were no answers using this in the way OP wanted it   So here s another solution  should someone come by missing it  -   public class DateTesting       public static void main String   args            String dateStart    11 03 14 09 29 58           String dateStop    11 03 14 09 33 43               Custom date format         SimpleDateFormat format   new SimpleDateFormat  yy MM dd HH mm ss               Date d1   null          Date d2   null          try               d1   format parse dateStart               d2   format parse dateStop             catch  ParseException e                e printStackTrace                              Get msec from each  and subtract          long diff   d2 getTime   - d1 getTime             long days   TimeUnit MILLISECONDS toDays diff           long remainingHoursInMillis   diff - TimeUnit DAYS toMillis days           long hours   TimeUnit MILLISECONDS toHours remainingHoursInMillis           long remainingMinutesInMillis   remainingHoursInMillis - TimeUnit HOURS toMillis hours           long minutes   TimeUnit MILLISECONDS toMinutes remainingMinutesInMillis           long remainingSecondsInMillis   remainingMinutesInMillis - TimeUnit MINUTES toMillis minutes           long seconds   TimeUnit MILLISECONDS toSeconds remainingSecondsInMillis            System out println  Days      days      hours      hours      minutes      minutes      seconds      seconds             Although just calculating the difference yourself can be done  it s not very meaningful to do it like that and I think TimeUnit is a highly overlooked class

User · Answer

Here is my code       import java util Date      to calculate difference between two days public class DateDifference       to calculate difference between two dates in milliseconds public long getDateDiffInMsec Date da  Date db        long diffMSec   0      diffMSec   db getTime   - da getTime        return diffMSec        to convert Milliseconds into DD HH MM SS format  public String getDateFromMsec long diffMSec        int left   0      int ss   0      int mm   0      int hh   0      int dd   0      left    int   diffMSec   1000       ss   left   60      left    int  left   60      if  left  gt  0            mm   left   60          left    int  left   60          if  left  gt  0                hh   left   24              left    int  left   24              if  left  gt  0                    dd   left                                    String diff   Integer toString dd          Integer toString hh                      Integer toString mm          Integer toString ss       return diff

User · Answer

difference-between-two-dates-in-java  Extracted the code from the link  public class TimeDiff                   For testing purposes                     public static void main String   args            Date d1   new Date            try   Thread sleep 750     catch InterruptedException e       ignore                    Date d0   new Date System currentTimeMillis   -  1000 60 60 24 3       About 3 days ago         long   diff   TimeDiff getTimeDifference d0  d1            System out printf  Time difference is  d day s    d hour s    d minute s    d second s  and  d millisecond s  n                   diff 0   diff 1   diff 2   diff 3   diff 4            System out printf  Just the number of days    d n                   TimeDiff getTimeDifference d0  d1  TimeDiff TimeField DAY                          Calculate the absolute difference between two Date without        regard for time offsets                param d1 Date one         param d2 Date two         param field The field we re interested in out of        day  hour  minute  second  millisecond                return The value of the required field             public static long getTimeDifference Date d1  Date d2  TimeField field            return TimeDiff getTimeDifference d1  d2  field ordinal                           Calculate the absolute difference between two Date without        regard for time offsets                param d1 Date one         param d2 Date two         return The fields day  hour  minute  second and millisecond             public static long   getTimeDifference Date d1  Date d2            long   result   new long 5           Calendar cal   Calendar getInstance            cal setTimeZone TimeZone getTimeZone  UTC             cal setTime d1            long t1   cal getTimeInMillis            cal setTime d2            long diff   Math abs cal getTimeInMillis   - t1           final int ONE DAY   1000   60   60   24          final int ONE HOUR   ONE DAY   24          final int ONE MINUTE   ONE HOUR   60          final int ONE SECOND   ONE MINUTE   60           long d   diff   ONE DAY          diff    ONE DAY           long h   diff   ONE HOUR          diff    ONE HOUR           long m   diff   ONE MINUTE          diff    ONE MINUTE           long s   diff   ONE SECOND          long ms   diff   ONE SECOND          result 0    d          result 1    h          result 2    m          result 3    s          result 4    ms           return result             public static void printDiffs long   diffs            System out printf  Days           3d n   diffs 0            System out printf  Hours          3d n   diffs 1            System out printf  Minutes        3d n   diffs 2            System out printf  Seconds        3d n   diffs 3            System out printf  Milliseconds   3d n   diffs 4               public static enum TimeField  DAY          HOUR          MINUTE          SECOND          MILLISECOND

User · Answer

As said before - think this is a good answer             param d2 the later date      param d1 the earlier date     param timeUnit - Example Calendar HOUR OF DAY     return     public static int getTimeDifference Date d2 Date d1  int timeUnit         Date diff   new Date d2 getTime   - d1 getTime           Calendar calendar   Calendar getInstance         calendar setTime diff        int hours   calendar get Calendar HOUR OF DAY        int minutes   calendar get Calendar MINUTE        int seconds   calendar get Calendar SECOND        if timeUnit  Calendar HOUR OF DAY           return hours       if timeUnit  Calendar MINUTE           return minutes       return seconds

User · Answer

Try this for a friendly representation of time differences  in milliseconds    String friendlyTimeDiff long timeDifferenceMilliseconds        long diffSeconds   timeDifferenceMilliseconds   1000      long diffMinutes   timeDifferenceMilliseconds    60   1000       long diffHours   timeDifferenceMilliseconds    60   60   1000       long diffDays   timeDifferenceMilliseconds    60   60   1000   24       long diffWeeks   timeDifferenceMilliseconds    60   60   1000   24   7       long diffMonths    long   timeDifferenceMilliseconds    60   60   1000   24   30 41666666        long diffYears   timeDifferenceMilliseconds     long 60   60   1000   24   365        if  diffSeconds  lt  1            return  less than a second         else if  diffMinutes  lt  1            return diffSeconds     seconds         else if  diffHours  lt  1            return diffMinutes     minutes         else if  diffDays  lt  1            return diffHours     hours         else if  diffWeeks  lt  1            return diffDays     days         else if  diffMonths  lt  1            return diffWeeks     weeks         else if  diffYears  lt  1            return diffMonths     months         else           return diffYears     years

User · Answer

This is more of a maths problem than a java problem basically   The result you receive is correct   This because 225 seconds is 3 minutes  when doing an integral division    What you want is the this    divide by 1000 to get the number of seconds -  rest is milliseconds divide that by 60 to get number of minutes -  rest are seconds divide that by 60 to get number of hours -  rest are minutes   or in java   int millis   diff   1000  diff  1000  int seconds   diff   60  diff  60  int minutes   diff   60  diff  60  hours   diff

User · Answer

I would prefer to use suggested java util concurrent TimeUnit class   long diff   d2 getTime   - d1 getTime     as given  long seconds   TimeUnit MILLISECONDS toSeconds diff   long minutes   TimeUnit MILLISECONDS toMinutes diff

User · Answer

Since Java 5  you can use java util concurrent TimeUnit to avoid the use of Magic Numbers like 1000 and 60 in your code   By the way  you should take care to leap seconds in your computation  the last minute of a year may have an additional leap second so it indeed lasts 61 seconds instead of expected 60 seconds  The ISO specification even plan for possibly 61 seconds  You can find detail in java util Date javadoc

User · Answer

Here is a suggestion  using TimeUnit  to obtain each time part and format them   private static String formatDuration long duration        long hours   TimeUnit MILLISECONDS toHours duration       long minutes   TimeUnit MILLISECONDS toMinutes duration    60      long seconds   TimeUnit MILLISECONDS toSeconds duration    60      long milliseconds   duration   1000      return String format   02d  02d  02d  03d   hours  minutes  seconds  milliseconds      SimpleDateFormat sdf   new SimpleDateFormat  HH mm ss SSS    Date startTime   sdf parse  01 00 22 427    Date now   sdf parse  02 06 38 355    long duration   now getTime   - startTime getTime    System out println formatDuration duration      The result is  01 06 15 928

User · Answer

long diffSeconds    diff   1000  60  try this and let me know if it works correctly

[java] Calculate date/time difference in java

Joda-Time

Examples related to java

Examples related to time