JavaScript Dates

Date and Time are used in our everyday lives. It is important to understand how to use Date and Time in computer programming. You might have to create a website with a calendar. The application should show relevant times based on the user's current timezone. 

JavaScript offers us a date handling functionality through a powerful object: Date
A Date object instance represents a single point in time. Despite being named Date, it also handles time.

JavaScript Date Output

By default, JavaScript will use the browser's time zone and display a date as a full text string:

Wed Aug 08 2018 10:00:00 GMT+0200 (Central European Summer Time)


Learn more about JavaScript Date Formats

Create Date Objects

JS JavaScript - Create Date Objects

// creates a new date object with the current date and time
new Date()
// creates a new date object with a specified date and time, e.g. 5 numbers specify year, month, day, hour, and minute
new Date(year, month, day, hours, minutes, seconds, milliseconds)  
// If you supply only one parameter it will be treated as milliseconds since 01 January 1970
new Date(milliseconds)
// creates a new date object from a date string, e.g. "August 08, 2018 11:24:00"
new Date(date string)

Learn more about JavaScript Date Set Methods Learn more about JavaScript Date Get Methods

Comparing Dates

Comparing dates can be confusing. Take a look at the following examples to fully understand how to compare dates.

Learn more about JavaScript Comparisons

We will first show you the common misunderstanding how to compare dates.

function CompareDate() {  
   // Note: 00 is month January  
   var dateOne = new Date(2018, 00, 15); //Year, Month, Date  
   var dateTwo = new Date(2018, 00, 15); //Year, Month, Date  
   //NB: This code will not work when the dates are equal
   if (dateOne == dateTwo) {  
      alert("Dates are equal - NB: This will not work");  
   else if (dateOne > dateTwo) {  
      alert("Date One is greater than Date Two.");  
   else {  
      alert("Date Two is greater than Date One.");  


Comparing Dates using Millisecond format

First, create a Date Object(see examples above for how to create a Date-Object).
Then, use the Date-object`s getTime() function to get the millisecond-format.
This will give you a correct result comparing dates.

JS JavaScript - Comparing Dates using Millisecond format

function CompareDate() {  
   // Note: 00 is month i.e. January  
   var dateOne = new Date(2013, 00, 15); //Year, Month, Date
   var dateTwo = new Date(2013, 00, 15); //Year, Month, Date
   // Using the millisecond format of the given dates
   var dateOneMillesecond = dateOne.getTime();
   var dateTwoMillesecond = dateTwo.getTime();
   // This code will find out when the dates are equal       
   if (dateOneMillesecond == dateTwoMillesecond) {  
      alert("Dates are equal");  
   else if (dateOneMillesecond > dateTwoMillesecond) {  
      alert("Date One is greater than Date Two.");  
   else  {  
      alert("Date Two is greater than Date One.");  



Check this out

JS JavaScript: Events

Events are actions or occurrences that happen to HTML elements.

JavaScript can act when an HTML Event occurs.

Events can represent everything from basic user interactions to automated notifications of things happening in the rendering model.

JS JavaScript: Numbers Methods

Number methods can help you when working with number datatypes. The number methods are improved in ES6 (ECMAScript 6).

Keep reading to understand how the number methods and properties may help you.

JS JavaScript: Random

JavaScript have a Random number function. The method can generate a number in a specific range. The number can not be reasonably be predicted.

JS JavaScript: Variables

A variable contains a value. When you use the variable, you refer to the data it represents. You use variables to store, retrieve and manipulate values in your code.


JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.

The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.


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