JavaScript: Get the human readable format of the given number of milliseconds

JavaScript fundamental (ES6 Syntax): Exercise-230 with Solution

Write a JavaScript program to generate the human-readable format in the given number of milliseconds.

  • Divide ms with the appropriate values to obtain the appropriate values for day, hour, minute, second and millisecond.
  • Use Object.entries() with Array.prototype.filter() to keep only non-zero values.
  • Use Array.prototype.map() to create the string for each value, pluralizing appropriately.
  • Use String.prototype.join(', ') to combine the values into a string.

Sample Solution:

JavaScript Code:

// Define a function 'formatDuration' that converts milliseconds to a human-readable duration format
const formatDuration = ms => {
  // If milliseconds are negative, convert them to positive
  if (ms < 0) ms = -ms;
  // Define an object 'time' to store the duration components
  const time = {
    day: Math.floor(ms / 86400000), // Calculate number of days
    hour: Math.floor(ms / 3600000) % 24, // Calculate number of hours (mod 24 to get the remaining hours)
    minute: Math.floor(ms / 60000) % 60, // Calculate number of minutes (mod 60 to get the remaining minutes)
    second: Math.floor(ms / 1000) % 60, // Calculate number of seconds (mod 60 to get the remaining seconds)
    millisecond: Math.floor(ms) % 1000 // Calculate number of milliseconds (mod 1000 to get the remaining milliseconds)
  // Convert the 'time' object to an array of key-value pairs, filter out components with a value of 0, and format each component
  return Object.entries(time)
    .filter(val => val[1] !== 0) // Filter out components with a value of 0
    .map(val => val[1] + ' ' + (val[1] !== 1 ? val[0] + 's' : val[0])) // Format each component
    .join(', '); // Join the formatted components with a comma and space

// Test cases
console.log(formatDuration(1001)); // Output: "1 second, 1 millisecond"
console.log(formatDuration(34325055574)); // Output: "397 days, 6 hours, 9 minutes, 15 seconds, 574 milliseconds"


1 second, 1 millisecond
397 days, 6 hours, 44 minutes, 15 seconds, 574 milliseconds


flowchart: Get the human readable format of the given number of milliseconds.

Live Demo:

See the Pen javascript-basic-exercise-230-1 by w3resource (@w3resource) on CodePen.

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