How to format a duration in java e g format H MM SS

Question

I d like to format a duration in seconds using a pattern like H MM SS  The current utilities in java are designed to format a time but not a duration

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in scala  no library needed   def prettyDuration str List String  seconds Long  List String      seconds match       case t if t  lt  60   gt  str   List s   t  seconds       case t if  t  gt   60  amp  amp  t lt  3600     gt  List s   t   60  minutes     prettyDuration str  t 60      case t if  t  gt   3600  amp  amp  t lt  3600 24     gt  List s   t   3600  hours     prettyDuration str  t 3600      case t if  t gt   3600 24     gt  List s   t    3600 24   days     prettyDuration str  t  3600 24         val dur   prettyDuration List empty String   12345  mkString

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How about the following function  which returns either   H MM SS or  H MM SS sss  public static String formatInterval final long interval  boolean millisecs         final long hr   TimeUnit MILLISECONDS toHours interval       final long min   TimeUnit MILLISECONDS toMinutes interval   60      final long sec   TimeUnit MILLISECONDS toSeconds interval   60      final long ms   TimeUnit MILLISECONDS toMillis interval   1000      if  millisecs             return String format   02d  02d  02d  03d   hr  min  sec  ms         else           return String format   02d  02d  02d   hr  min  sec

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This answer only uses Duration methods and works with Java 8    public static String format Duration d        long days   d toDays        d   d minusDays days       long hours   d toHours        d   d minusHours hours       long minutes   d toMinutes        d   d minusMinutes minutes       long seconds   d getSeconds         return               days     0    days   jours                   hours    0    hours   heures                   minutes     0    minutes   minutes                   seconds    0    seconds   secondes

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This is easier since Java 9  A Duration still isn   t formattable  but methods for getting the hours  minutes and seconds are added  which makes the task somewhat more straightforward       LocalDateTime start   LocalDateTime of 2019  Month JANUARY  17  15  24  12       LocalDateTime end   LocalDateTime of 2019  Month JANUARY  18  15  43  33       Duration diff   Duration between start  end       String hms   String format   d  02d  02d                                    diff toHours                                     diff toMinutesPart                                     diff toSecondsPart         System out println hms     The output from this snippet is      24 19 21

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In Scala  building up on YourBestBet s solution but simplified   def prettyDuration seconds  Long   List String    seconds match     case t if t  lt  60        gt  List s   t  seconds     case t if t  lt  3600      gt  s   t   60  minutes     prettyDuration t   60    case t if t  lt  3600 24   gt  s   t   3600  hours     prettyDuration t   3600    case t                  gt  s   t    3600 24   days     prettyDuration t    3600 24      val dur   prettyDuration 12345  mkString            gt  3 hours  25 minutes  45 seconds

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I m not sure that is you want  but check this Android helper class import android text format DateUtils  For example  DateUtils formatElapsedTime   android date duration elapsedtime

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If you don t want to drag in libraries  it s simple enough to do yourself using a Formatter  or related shortcut eg  given integer number of seconds s     String format   d  02d  02d   s   3600   s   3600    60   s   60

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Here is one more sample how to format duration  Note that this sample shows both positive and negative duration as positive duration   import static java time temporal ChronoUnit DAYS  import static java time temporal ChronoUnit HOURS  import static java time temporal ChronoUnit MINUTES  import static java time temporal ChronoUnit SECONDS   import java time Duration   public class DurationSample       public static void main String   args              Let s say duration of 2days 3hours 12minutes and 46seconds         Duration d   Duration ZERO plus 2  DAYS  plus 3  HOURS  plus 12  MINUTES  plus 46  SECONDS              in case of negative duration         if d isNegative    d   d negated               format DAYS HOURS MINUTES SECONDS          System out printf  Total duration is  sdays  shrs  smin  ssec  n   d toDays    d toHours     24  d toMinutes     60  d getSeconds     60              or format HOURS MINUTES SECONDS          System out printf  Or total duration is  shrs  smin  sec  n   d toHours    d toMinutes     60  d getSeconds     60              or format MINUTES SECONDS          System out printf  Or total duration is  smin  ssec  n   d toMinutes    d getSeconds     60              or format SECONDS only          System out printf  Or total duration is  ssec  n   d getSeconds

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Here is one more sample how to format duration  Note that this sample shows both positive and negative duration as positive duration   import static java time temporal ChronoUnit DAYS  import static java time temporal ChronoUnit HOURS  import static java time temporal ChronoUnit MINUTES  import static java time temporal ChronoUnit SECONDS   import java time Duration   public class DurationSample       public static void main String   args              Let s say duration of 2days 3hours 12minutes and 46seconds         Duration d   Duration ZERO plus 2  DAYS  plus 3  HOURS  plus 12  MINUTES  plus 46  SECONDS              in case of negative duration         if d isNegative    d   d negated               format DAYS HOURS MINUTES SECONDS          System out printf  Total duration is  sdays  shrs  smin  ssec  n   d toDays    d toHours     24  d toMinutes     60  d getSeconds     60              or format HOURS MINUTES SECONDS          System out printf  Or total duration is  shrs  smin  sec  n   d toHours    d toMinutes     60  d getSeconds     60              or format MINUTES SECONDS          System out printf  Or total duration is  smin  ssec  n   d toMinutes    d getSeconds     60              or format SECONDS only          System out printf  Or total duration is  ssec  n   d getSeconds

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In scala  I saw some other attempts  and wasn t impressed    def formatDuration duration  Duration   String       import duration      get access to all the members      f  toDaysPart  toHoursPart 02d  toMinutesPart 02d  toSecondsPart 02d  toMillisPart 03d      Looks horrible yes  Well that s why we use IDEs to write this stuff so that the method calls   toHoursPart etc  are a different color   The f      is a printf String format style string interpolator  which is what allows the   code injection to work  Given an output of 1 14 06 32 583  the f interpolated string would be equivalent to String format  1  02d  02d  02d  03d   14  6  32  583

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String duration Temporal from  Temporal to        final StringBuilder builder   new StringBuilder        for  ChronoUnit unit   new ChronoUnit   YEARS  MONTHS  WEEKS  DAYS  HOURS  MINUTES  SECONDS             long amount   unit between from  to           if  amount    0                continue                    builder append                       append amount                   append                       append unit name   toLowerCase             from   from plus amount  unit             return builder toString   trim

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using this func private static String strDuration long duration        int ms  s  m  h  d      double dec      double time   duration   1 0       time    time   1000 0       dec   time   1      time   time - dec      ms    int  dec   1000        time    time   60 0       dec   time   1      time   time - dec      s    int  dec   60        time    time   60 0       dec   time   1      time   time - dec      m    int  dec   60        time    time   24 0       dec   time   1      time   time - dec      h    int  dec   24            d    int time           return  String format  quot  d d -  02d  02d  02d  03d quot   d  h  m  s  ms

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long duration   4   60   60   1000  SimpleDateFormat sdf   new SimpleDateFormat  HH mm ss SSS   Locale getDefault     log info  Duration      sdf format new Date duration - TimeZone getDefault   getRawOffset

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There s a fairly simple and  IMO  elegant approach  at least for durations of less than 24 hours   DateTimeFormatter ISO LOCAL TIME format value addTo LocalTime of 0  0     Formatters need a temporal object to format  so you can create one by adding the duration to a LocalTime of 00 00  i e  midnight   This will give you a LocalTime representing the duration from midnight to that time  which is then easy to format in standard HH mm ss notation  This has the advantage of not needing an external library  and uses the java time library to do the calculation  rather than manually calculating the hours  minutes and seconds

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in scala  no library needed   def prettyDuration str List String  seconds Long  List String      seconds match       case t if t  lt  60   gt  str   List s   t  seconds       case t if  t  gt   60  amp  amp  t lt  3600     gt  List s   t   60  minutes     prettyDuration str  t 60      case t if  t  gt   3600  amp  amp  t lt  3600 24     gt  List s   t   3600  hours     prettyDuration str  t 3600      case t if  t gt   3600 24     gt  List s   t    3600 24   days     prettyDuration str  t  3600 24         val dur   prettyDuration List empty String   12345  mkString

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You can use java time Duration which is modelled on ISO-8601 standards and was introduced with Java-8 as part of JSR-310 implementation  With Java-9 some more convenience methods were introduced  Demo  import java time Duration  import java time LocalDateTime  import java time Month   public class Main       public static void main String   args            LocalDateTime startDateTime   LocalDateTime of 2020  Month DECEMBER  10  15  20  25           LocalDateTime endDateTime   LocalDateTime of 2020  Month DECEMBER  10  18  24  30            Duration duration   Duration between startDateTime  endDateTime              Default format         System out println duration               Custom format                                                Java-8                                             String formattedElapsedTime   String format  quot  02d  02d  02d quot   duration toHours     24                  duration toMinutes     60  duration toSeconds     60           System out println formattedElapsedTime                                                                                                                                             Java-9                                             formattedElapsedTime   String format  quot  02d  02d  02d quot   duration toHoursPart    duration toMinutesPart                    duration toSecondsPart             System out println formattedElapsedTime                                                                                                      Output  PT3H4M5S 03 04 05 03 04 05  Learn about the modern date-time API from Trail  Date Time   For any reason  if you have to stick to Java 6 or Java 7  you can use ThreeTen-Backport which backports most of the java time functionality to Java 6  amp  7  If you are working for an Android project and your Android API level is still not compliant with Java-8  check Java 8  APIs available through desugaring and How to use ThreeTenABP in Android Project

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If you re using a version of Java prior to 8    you can use Joda Time and PeriodFormatter  If you ve really got a duration  i e  an elapsed amount of time  with no reference to a calendar system  then you should probably be using Duration for the most part - you can then call toPeriod  specifying whatever PeriodType you want to reflect whether 25 hours becomes 1 day and 1 hour or not  etc  to get a Period which you can format   If you re using Java 8 or later  I d normally suggest using java time Duration to represent the duration  You can then call getSeconds   or the like to obtain an integer for standard string formatting as per bobince s answer if you need to - although you should be careful of the situation where the duration is negative  as you probably want a single negative sign in the output string  So something like   public static String formatDuration Duration duration        long seconds   duration getSeconds        long absSeconds   Math abs seconds       String positive   String format            d  02d  02d           absSeconds   3600           absSeconds   3600    60          absSeconds   60       return seconds  lt  0    -    positive   positive      Formatting this way is reasonably simple  if annoyingly manual  For parsing it becomes a harder matter in general    You could still use Joda Time even with Java 8 if you want to  of course

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String duration Temporal from  Temporal to        final StringBuilder builder   new StringBuilder        for  ChronoUnit unit   new ChronoUnit   YEARS  MONTHS  WEEKS  DAYS  HOURS  MINUTES  SECONDS             long amount   unit between from  to           if  amount    0                continue                    builder append                       append amount                   append                       append unit name   toLowerCase             from   from plus amount  unit             return builder toString   trim

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long duration   4   60   60   1000  SimpleDateFormat sdf   new SimpleDateFormat  HH mm ss SSS   Locale getDefault     log info  Duration      sdf format new Date duration - TimeZone getDefault   getRawOffset

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If you re using a version of Java prior to 8    you can use Joda Time and PeriodFormatter  If you ve really got a duration  i e  an elapsed amount of time  with no reference to a calendar system  then you should probably be using Duration for the most part - you can then call toPeriod  specifying whatever PeriodType you want to reflect whether 25 hours becomes 1 day and 1 hour or not  etc  to get a Period which you can format   If you re using Java 8 or later  I d normally suggest using java time Duration to represent the duration  You can then call getSeconds   or the like to obtain an integer for standard string formatting as per bobince s answer if you need to - although you should be careful of the situation where the duration is negative  as you probably want a single negative sign in the output string  So something like   public static String formatDuration Duration duration        long seconds   duration getSeconds        long absSeconds   Math abs seconds       String positive   String format            d  02d  02d           absSeconds   3600           absSeconds   3600    60          absSeconds   60       return seconds  lt  0    -    positive   positive      Formatting this way is reasonably simple  if annoyingly manual  For parsing it becomes a harder matter in general    You could still use Joda Time even with Java 8 if you want to  of course

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There is yet another way to make it for java8 public String formatDuration Duration duration        DateTimeFormatter formatter   DateTimeFormatter ofPattern  quot h mm SSS quot        return LocalTime ofNanoOfDay duration toNanos    format formatter

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This answer only uses Duration methods and works with Java 8    public static String format Duration d        long days   d toDays        d   d minusDays days       long hours   d toHours        d   d minusHours hours       long minutes   d toMinutes        d   d minusMinutes minutes       long seconds   d getSeconds         return               days     0    days   jours                   hours    0    hours   heures                   minutes     0    minutes   minutes                   seconds    0    seconds   secondes

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using this func private static String strDuration long duration        int ms  s  m  h  d      double dec      double time   duration   1 0       time    time   1000 0       dec   time   1      time   time - dec      ms    int  dec   1000        time    time   60 0       dec   time   1      time   time - dec      s    int  dec   60        time    time   60 0       dec   time   1      time   time - dec      m    int  dec   60        time    time   24 0       dec   time   1      time   time - dec      h    int  dec   24            d    int time           return  String format  quot  d d -  02d  02d  02d  03d quot   d  h  m  s  ms

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In Scala  building up on YourBestBet s solution but simplified   def prettyDuration seconds  Long   List String    seconds match     case t if t  lt  60        gt  List s   t  seconds     case t if t  lt  3600      gt  s   t   60  minutes     prettyDuration t   60    case t if t  lt  3600 24   gt  s   t   3600  hours     prettyDuration t   3600    case t                  gt  s   t    3600 24   days     prettyDuration t    3600 24      val dur   prettyDuration 12345  mkString            gt  3 hours  25 minutes  45 seconds

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This might be kind of hacky  but it is a good solution if one is bent on accomplishing this using Java 8 s java time   import java time Duration  import java time LocalDateTime  import java time format DateTimeFormatter  import java time format DateTimeFormatterBuilder  import java time temporal ChronoField  import java time temporal Temporal  import java time temporal TemporalAccessor  import java time temporal TemporalField  import java time temporal UnsupportedTemporalTypeException   public class TemporalDuration implements TemporalAccessor       private static final Temporal BASE TEMPORAL   LocalDateTime of 0  1  1  0  0        private final Duration duration      private final Temporal temporal       public TemporalDuration Duration duration            this duration   duration          this temporal   duration addTo BASE TEMPORAL               Override     public boolean isSupported TemporalField field            if  temporal isSupported field   return false          long value   temporal getLong field -BASE TEMPORAL getLong field           return value  0L              Override     public long getLong TemporalField field            if  isSupported field   throw new UnsupportedTemporalTypeException new StringBuilder   append field toString    toString             return temporal getLong field -BASE TEMPORAL getLong field              public Duration getDuration             return duration              Override     public String toString             return dtf format this              private static final DateTimeFormatter dtf   new DateTimeFormatterBuilder                optionalStart    second              optionalStart    minute              optionalStart    hour              optionalStart    day              optionalStart    month              optionalStart    year              appendValue ChronoField YEAR  appendLiteral   Years    optionalEnd                appendValue ChronoField MONTH OF YEAR  appendLiteral   Months    optionalEnd                appendValue ChronoField DAY OF MONTH  appendLiteral   Days    optionalEnd                appendValue ChronoField HOUR OF DAY  appendLiteral   Hours    optionalEnd                appendValue ChronoField MINUTE OF HOUR  appendLiteral   Minutes    optionalEnd                appendValue ChronoField SECOND OF MINUTE  appendLiteral   Seconds   optionalEnd                toFormatter

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If you don t want to drag in libraries  it s simple enough to do yourself using a Formatter  or related shortcut eg  given integer number of seconds s     String format   d  02d  02d   s   3600   s   3600    60   s   60

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I use Apache common s DurationFormatUtils like so     DurationFormatUtils formatDuration millis     H mm ss     true

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If you re using a version of Java prior to 8    you can use Joda Time and PeriodFormatter  If you ve really got a duration  i e  an elapsed amount of time  with no reference to a calendar system  then you should probably be using Duration for the most part - you can then call toPeriod  specifying whatever PeriodType you want to reflect whether 25 hours becomes 1 day and 1 hour or not  etc  to get a Period which you can format   If you re using Java 8 or later  I d normally suggest using java time Duration to represent the duration  You can then call getSeconds   or the like to obtain an integer for standard string formatting as per bobince s answer if you need to - although you should be careful of the situation where the duration is negative  as you probably want a single negative sign in the output string  So something like   public static String formatDuration Duration duration        long seconds   duration getSeconds        long absSeconds   Math abs seconds       String positive   String format            d  02d  02d           absSeconds   3600           absSeconds   3600    60          absSeconds   60       return seconds  lt  0    -    positive   positive      Formatting this way is reasonably simple  if annoyingly manual  For parsing it becomes a harder matter in general    You could still use Joda Time even with Java 8 if you want to  of course

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I m not sure that is you want  but check this Android helper class import android text format DateUtils  For example  DateUtils formatElapsedTime   android date duration elapsedtime

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If you don t want to drag in libraries  it s simple enough to do yourself using a Formatter  or related shortcut eg  given integer number of seconds s     String format   d  02d  02d   s   3600   s   3600    60   s   60

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My library Time4J offers a pattern-based solution  similar to Apache DurationFormatUtils  but more flexible    Duration lt ClockUnit gt  duration       Duration of -573421  ClockUnit SECONDS     input in seconds only      with Duration STD CLOCK PERIOD      performs normalization to h mm ss-structure String fs   Duration formatter ClockUnit class      h mm ss   format duration   System out println fs      output   gt  -159 17 01   This code demonstrates the capabilities to handle hour overflow and sign handling  see also the API of duration-formatter based on pattern

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If you don t want to drag in libraries  it s simple enough to do yourself using a Formatter  or related shortcut eg  given integer number of seconds s     String format   d  02d  02d   s   3600   s   3600    60   s   60

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Looking at all those calculations  it may is helpful that most of the Units  Hours  Minutes  etc   have a  toFooPart   convenience method  E g  Duration ofMinutes 110L  toMinutesPart      50  Read  the minutes elapsed to the next value of the parent unit  Hour

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This might be kind of hacky  but it is a good solution if one is bent on accomplishing this using Java 8 s java time   import java time Duration  import java time LocalDateTime  import java time format DateTimeFormatter  import java time format DateTimeFormatterBuilder  import java time temporal ChronoField  import java time temporal Temporal  import java time temporal TemporalAccessor  import java time temporal TemporalField  import java time temporal UnsupportedTemporalTypeException   public class TemporalDuration implements TemporalAccessor       private static final Temporal BASE TEMPORAL   LocalDateTime of 0  1  1  0  0        private final Duration duration      private final Temporal temporal       public TemporalDuration Duration duration            this duration   duration          this temporal   duration addTo BASE TEMPORAL               Override     public boolean isSupported TemporalField field            if  temporal isSupported field   return false          long value   temporal getLong field -BASE TEMPORAL getLong field           return value  0L              Override     public long getLong TemporalField field            if  isSupported field   throw new UnsupportedTemporalTypeException new StringBuilder   append field toString    toString             return temporal getLong field -BASE TEMPORAL getLong field              public Duration getDuration             return duration              Override     public String toString             return dtf format this              private static final DateTimeFormatter dtf   new DateTimeFormatterBuilder                optionalStart    second              optionalStart    minute              optionalStart    hour              optionalStart    day              optionalStart    month              optionalStart    year              appendValue ChronoField YEAR  appendLiteral   Years    optionalEnd                appendValue ChronoField MONTH OF YEAR  appendLiteral   Months    optionalEnd                appendValue ChronoField DAY OF MONTH  appendLiteral   Days    optionalEnd                appendValue ChronoField HOUR OF DAY  appendLiteral   Hours    optionalEnd                appendValue ChronoField MINUTE OF HOUR  appendLiteral   Minutes    optionalEnd                appendValue ChronoField SECOND OF MINUTE  appendLiteral   Seconds   optionalEnd                toFormatter

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You can use java time Duration which is modelled on ISO-8601 standards and was introduced with Java-8 as part of JSR-310 implementation  With Java-9 some more convenience methods were introduced  Demo  import java time Duration  import java time LocalDateTime  import java time Month   public class Main       public static void main String   args            LocalDateTime startDateTime   LocalDateTime of 2020  Month DECEMBER  10  15  20  25           LocalDateTime endDateTime   LocalDateTime of 2020  Month DECEMBER  10  18  24  30            Duration duration   Duration between startDateTime  endDateTime              Default format         System out println duration               Custom format                                                Java-8                                             String formattedElapsedTime   String format  quot  02d  02d  02d quot   duration toHours     24                  duration toMinutes     60  duration toSeconds     60           System out println formattedElapsedTime                                                                                                                                             Java-9                                             formattedElapsedTime   String format  quot  02d  02d  02d quot   duration toHoursPart    duration toMinutesPart                    duration toSecondsPart             System out println formattedElapsedTime                                                                                                      Output  PT3H4M5S 03 04 05 03 04 05  Learn about the modern date-time API from Trail  Date Time   For any reason  if you have to stick to Java 6 or Java 7  you can use ThreeTen-Backport which backports most of the java time functionality to Java 6  amp  7  If you are working for an Android project and your Android API level is still not compliant with Java-8  check Java 8  APIs available through desugaring and How to use ThreeTenABP in Android Project

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My library Time4J offers a pattern-based solution  similar to Apache DurationFormatUtils  but more flexible    Duration lt ClockUnit gt  duration       Duration of -573421  ClockUnit SECONDS     input in seconds only      with Duration STD CLOCK PERIOD      performs normalization to h mm ss-structure String fs   Duration formatter ClockUnit class      h mm ss   format duration   System out println fs      output   gt  -159 17 01   This code demonstrates the capabilities to handle hour overflow and sign handling  see also the API of duration-formatter based on pattern

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If you re using a version of Java prior to 8    you can use Joda Time and PeriodFormatter  If you ve really got a duration  i e  an elapsed amount of time  with no reference to a calendar system  then you should probably be using Duration for the most part - you can then call toPeriod  specifying whatever PeriodType you want to reflect whether 25 hours becomes 1 day and 1 hour or not  etc  to get a Period which you can format   If you re using Java 8 or later  I d normally suggest using java time Duration to represent the duration  You can then call getSeconds   or the like to obtain an integer for standard string formatting as per bobince s answer if you need to - although you should be careful of the situation where the duration is negative  as you probably want a single negative sign in the output string  So something like   public static String formatDuration Duration duration        long seconds   duration getSeconds        long absSeconds   Math abs seconds       String positive   String format            d  02d  02d           absSeconds   3600           absSeconds   3600    60          absSeconds   60       return seconds  lt  0    -    positive   positive      Formatting this way is reasonably simple  if annoyingly manual  For parsing it becomes a harder matter in general    You could still use Joda Time even with Java 8 if you want to  of course

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I use Apache common s DurationFormatUtils like so     DurationFormatUtils formatDuration millis     H mm ss     true

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In scala  I saw some other attempts  and wasn t impressed    def formatDuration duration  Duration   String       import duration      get access to all the members      f  toDaysPart  toHoursPart 02d  toMinutesPart 02d  toSecondsPart 02d  toMillisPart 03d      Looks horrible yes  Well that s why we use IDEs to write this stuff so that the method calls   toHoursPart etc  are a different color   The f      is a printf String format style string interpolator  which is what allows the   code injection to work  Given an output of 1 14 06 32 583  the f interpolated string would be equivalent to String format  1  02d  02d  02d  03d   14  6  32  583

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This is easier since Java 9  A Duration still isn   t formattable  but methods for getting the hours  minutes and seconds are added  which makes the task somewhat more straightforward       LocalDateTime start   LocalDateTime of 2019  Month JANUARY  17  15  24  12       LocalDateTime end   LocalDateTime of 2019  Month JANUARY  18  15  43  33       Duration diff   Duration between start  end       String hms   String format   d  02d  02d                                    diff toHours                                     diff toMinutesPart                                     diff toSecondsPart         System out println hms     The output from this snippet is      24 19 21

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This is a working option   public static String showDuration LocalTime otherTime                 DateTimeFormatter df   DateTimeFormatter ISO LOCAL TIME      LocalTime now   LocalTime now        System out println  now      now       System out println  otherTime      otherTime       System out println  otherTime      otherTime format df         Duration span   Duration between otherTime  now       LocalTime fTime   LocalTime ofNanoOfDay span toNanos         String output   fTime format df        System out println output       return output      Call the method with  System out println showDuration LocalTime of 9  30  0  0       Produces something like   otherTime  09 30 otherTime  09 30 00 11 31 27 463 11 31 27 463

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There is yet another way to make it for java8 public String formatDuration Duration duration        DateTimeFormatter formatter   DateTimeFormatter ofPattern  quot h mm SSS quot        return LocalTime ofNanoOfDay duration toNanos    format formatter

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How about the following function  which returns either   H MM SS or  H MM SS sss  public static String formatInterval final long interval  boolean millisecs         final long hr   TimeUnit MILLISECONDS toHours interval       final long min   TimeUnit MILLISECONDS toMinutes interval   60      final long sec   TimeUnit MILLISECONDS toSeconds interval   60      final long ms   TimeUnit MILLISECONDS toMillis interval   1000      if  millisecs             return String format   02d  02d  02d  03d   hr  min  sec  ms         else           return String format   02d  02d  02d   hr  min  sec

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This is a working option   public static String showDuration LocalTime otherTime                 DateTimeFormatter df   DateTimeFormatter ISO LOCAL TIME      LocalTime now   LocalTime now        System out println  now      now       System out println  otherTime      otherTime       System out println  otherTime      otherTime format df         Duration span   Duration between otherTime  now       LocalTime fTime   LocalTime ofNanoOfDay span toNanos         String output   fTime format df        System out println output       return output      Call the method with  System out println showDuration LocalTime of 9  30  0  0       Produces something like   otherTime  09 30 otherTime  09 30 00 11 31 27 463 11 31 27 463

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There s a fairly simple and  IMO  elegant approach  at least for durations of less than 24 hours   DateTimeFormatter ISO LOCAL TIME format value addTo LocalTime of 0  0     Formatters need a temporal object to format  so you can create one by adding the duration to a LocalTime of 00 00  i e  midnight   This will give you a LocalTime representing the duration from midnight to that time  which is then easy to format in standard HH mm ss notation  This has the advantage of not needing an external library  and uses the java time library to do the calculation  rather than manually calculating the hours  minutes and seconds

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Looking at all those calculations  it may is helpful that most of the Units  Hours  Minutes  etc   have a  toFooPart   convenience method  E g  Duration ofMinutes 110L  toMinutesPart      50  Read  the minutes elapsed to the next value of the parent unit  Hour

[java] How to format a duration in java? (e.g format H:MM:SS)

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