From milliseconds to hour minutes seconds and milliseconds

Question

I need to go from milliseconds to a tuple of  hour  minutes  seconds  milliseconds  representing the same amount of time  E g    10799999ms   2h 59m 59s 999ms  The following pseudo-code is the only thing I could come up with      The division operator below returns the result as a rounded down integer function to tuple x       h   x    60 60 1000      x   x - h  60 60 1000      m   x    60 1000      x   x - m  60 1000      s   x   1000     x   x - s 1000     return  h m s x    I m sure it must be possible to do it smarter more elegant faster more compact

User · Answer

not really eleganter  but a bit shorter would be  function to tuple x      y   60 60 1000    h   x y    m    x- h y    y 60     s    x- h y - m  y 60    1000    mi   x- h y - m  y 60  - s 1000      return  h m s mi

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Arduino  c    version based on Valentinos answer  unsigned long timeNow   0  unsigned long mSecInHour   3600000  unsigned long TimeNow  0  int millisecs  0    int seconds   0  byte minutes   0  byte hours   0   void setup     Serial begin 9600   Serial println          because arduino monitor gets confused with line 1 Serial println   hours minutes seconds milliseconds        void loop     TimeNow   millis     hours   TimeNow mSecInHour  minutes    TimeNow- hours mSecInHour    mSecInHour 60   seconds    TimeNow- hours mSecInHour - minutes  mSecInHour 60    1000  millisecs   TimeNow- hours mSecInHour - minutes  mSecInHour 60  -        seconds 1000    Serial print hours     Serial print       Serial print minutes   Serial print        Serial print seconds    Serial print        Serial println millisecs

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import java text SimpleDateFormat  import java util Date  import java util concurrent TimeUnit   public class MyTest        public static void main String   args            long seconds   360000           long days   TimeUnit SECONDS toDays seconds           long hours   TimeUnit SECONDS toHours seconds - TimeUnit DAYS toSeconds days             System out println  days      days           System out println  hours      hours

User · Answer

Good question   Yes  one can do this more efficiently   Your CPU can extract both the quotient and the remainder of the ratio of two integers in a single operation   In  lt stdlib h gt   the function that exposes this CPU operation is called div     In your psuedocode  you d use it something like this   function to tuple x       qr   div x  1000      ms   qr rem     qr   div qr quot  60      s    qr rem     qr   div qr quot  60      m    qr rem     h    qr quot   A less efficient answer would use the   and   operators separately   However  if you need both quotient and remainder  anyway  then you might as well call the more efficient div

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Here is how I would do it in Java   int seconds    int   milliseconds   1000    60   int minutes    int    milliseconds    1000 60     60   int hours      int    milliseconds    1000 60 60     24

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Maybe can be shorter an more elegant  But I did it   public String getHumanTimeFormatFromMilliseconds String millisecondS       String message           long milliseconds   Long valueOf millisecondS       if  milliseconds  gt   1000           int seconds    int   milliseconds   1000    60          int minutes    int    milliseconds    1000   60     60           int hours    int    milliseconds    1000   60   60     24           int days    int   milliseconds    1000   60   60   24            if  days    0   amp  amp   hours    0                message   String format   d hours  d minutes  d seconds ago   hours  minutes  seconds            else if  hours    0   amp  amp   minutes    0                message   String format   d minutes  d seconds ago   minutes  seconds            else if  days    0   amp  amp   hours    0   amp  amp   minutes    0                message   String format   d seconds ago   seconds            else              message   String format   d days  d hours  d minutes  d seconds ago   days  hours  minutes  seconds                   else          message    Less than a second ago              return message

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milliseconds   12884983     or x milliseconds hr   0 min   0 sec   0  day   0 while  milliseconds  gt   1000      milliseconds    milliseconds - 1000    sec   sec   1   if  sec  gt   60  min   min   1   if  sec    60  sec   0   if  min  gt   60  hr   hr   1   if  min    60  min   0   if  hr  gt   24        hr    hr - 24      day   day   1         I hope that my shorter method will help you

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Just an other java example   long dayLength   1000   60   60   24  long dayMs   System currentTimeMillis     dayLength  double percentOfDay    double  dayMs   dayLength  int hour    int   percentOfDay   24   int minute    int   percentOfDay   24   60    60  int second    int   percentOfDay   24   60   60    60    an advantage is that you can simulate shorter days  if you adjust dayLength

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milliseconds   x total   0 while  milliseconds  gt   1000      milliseconds    milliseconds - 1000    total   total   1   hr   0 min   0 while  total  gt   60      total   total - 60   min   min   1   if  min  gt   60  hr   hr   1   if  min    60  min   0   sec   total   This is on groovy  but I thing that this is not problem for you  Method work perfect

[algorithm] From milliseconds to hour, minutes, seconds and milliseconds

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