In this tutorial, we will learn to check whether a JavaScript date is valid or not. Let’s understand why we need to validate the date in JavaScript by example. Suppose you have developed an application that takes some information in the submission form from the user. Users can make a mistake. What if they enter the wrong date in the input box? In such a case, developers need to validate the date. Here, we have three different methods to validate the date. Using the getTime() Method Using the isFinite() Method Using the Moment JS isValid() Method Using the ... Read More

To initialize a JavaScript Date to midnight, set hours like the following −setHours(0,0,0,0);ExampleYou can try to run the following code to set a date to midnight −Live Demo                    var dt;          dt = new Date();          dt.setHours(0,0,0,0);          document.write(dt);           OutputMon May 28 2018 00:00:00 GMT+0530 (India Standard Time)

While developing the applications, sometimes it needs to compare the only date. For example, you are developing some apps in which users must adhere to the deadline and pay for the subscription. If the user pays at any time on or before the end date of the subscription, the user will be able to use the subscription continues. Otherwise, you need to stop the subscription. In this tutorial, we will learn to compare only the date part without comparing the time in JavaScript. In the above cases, we need to compare the two dates without focusing on the time. Approach ... Read More

To convert a Unix timestamp to time, you can try to run the following code in JavaScript −ExampleLive Demo           JavaScript Dates                        var unix_time = 1514791901 ;          var date = new Date(unix_time*1000);          // get hours          var hrs = date.getHours();          // get minutes          var min = "0" + date.getMinutes();          // get seconds          var sec = "0" + date.getSeconds();          document.write("Time- "+hrs + ":" + min.substr(-2) + ":" + sec.substr(-2));           OutputTime- 13:01:41

To format a JavaScript date into “yyyy-mm-dd” format, use the toISOString() method. It converts using ISO standard i.e.YYYY-MM-DDTHH:mm:ss.sssExampleYou can try to run the following code to format a date. Live Demo           JavaScript Dates                    var date, res;          date = new Date();          res = date.toISOString();          document.write(res);           Output2018-12-15T08:13:47.648Z

To create a date object from date string, just add the string like this −var date = new Date(2018,1,1);ExampleYou can try to run the following code to create date object from date string. Here, the month is indexed as 0 for Jan, 1 for Feb, etc in JavaScript −Live Demo           JavaScript Dates                        var date;          date = new Date(2018,0,1);          document.write("Current Date: "+date);           OutputCurrent Date: Mon Jan 01 2018 00:00:00 GMT+0530 (India Standard Time)

In this tutorial, we will learn to convert the epoch Date to a meaningful JavaScript date. The epoch date is a representation of the date in milliseconds, and it is a total number of milliseconds since 1st January 1970 since the UNIX epochs started. Users can convert the total number of milliseconds into the meaningful date string using various approaches explained below. Using the new Date() Object In this approach, we will create the object of the Date class. The constructor of the Date() class takes the total number of milliseconds since the epoch started and converts it into the ... Read More

This tutorial teaches us to convert a string to a character array in JavaScript. A string is the sequence of characters. To solve our problem, we just need to split every character.There can be various ways to make a character array from the string in JavaScript, and some built-in methods can solve our problem. At the end of the tutorial, we will also learn the manual method of converting string to the array by popping a single character from it and pushing it into the array.This tutorial will look at five different methods to convert string to array. All methods ... Read More

In this tutorial, we are going to learn about how to calculate days from epoch using JavaScript. Here, we are going to use the Math.abs() and the Math.floor() methods to calculate days. First, we are going to learn about what an epoch is. What is Epoch? It is also referred to as epoch time or Unix time or Posix time. In a determining context, an epoch is the data and time relative to which a computer's clock and timestamps are determined. An epoch time is the number of seconds that have elapsed since Jan 1st, 1970 at midnight ... Read More

In this tutorial, we will learn to get the date and time since epoch in JavaScript. Sometimes, programmers need to find the total number of milliseconds, seconds, days, or other things from 1 January 1970 since the UNIX epochs started. So, users can use the Date() class of JavaScript or the Moment.js library of JavaScript to get the date and time since the epoch started. Using the Object of Date() Class In this approach, we will learn to get the current date from the UNIX epoch that has been started on 1 January 1970. In JavaScript, the Date() class contains ... Read More