Most idiomatic way to print a time difference in Java?

Question

I\'m familiar with printing time difference in milliseconds:

 long time = System.currentTimeMillis();
 //do something that takes some time...
 long completed         


        

Answer 1

long diff = System.currentTimeMillis() - startTime;
int hours = (int)(diff / 3600000); diff -= hours * 3600000;
int mins = (int)(diff / 60000); diff -= mins * 60000;
int secs = (int)(diff / 1000); diff -= secs * 1000;
System.out.println(String.format("%d:%d:%d.%d", hours, mins, secs, diff));