HarshitKaushik

  public static String getActivityTime(Date inputDate) {
    
    Date currentDate = new Date();
    Long currentTime = new Date().getTime();
    Long inputTime = inputDate.getTime();
    long timeRemaining = currentTime - inputTime;
    
    long sec = (timeRemaining / 1000) % 60;
    long min = (timeRemaining / (1000 * 60)) % 60;
    long hours = (timeRemaining / (1000 * 60 * 60)) % 24;

HarshitKaushik

This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.