There may be better modern alternatives. Tried now with latest 1.7.1 branch and it looks like isValid returns true for much more invalid dates and instead in one case false when the date is actually valid ; If the date is Invalid then the getTime() method will return NaN which is not equal to itself. If the value is greater than the range, it will fall in the next week. Could you please help me on this how to fix. We have also checked the leap year factor for the month of February. Considering using Moment in your project? Moment.js - Date validation example We can use the isValid() method to check if the date and time object is valid. No matter what language you use, working with date values is often a cumbersome process. Store the date object into a variable d.; Check if the variable d is created by Date object or not by using Object.prototype.toString.call(d) method. ; If the date is valid then the getTime() method will always be equal to itself. The lightweight JavaScript library Moment.js makes working with date and time values a breeze. I am using moment.js to get the 2 dates those are the from and to to pass my method. Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor. For more details and recommendations, ... Moment.js is freely distributable under the terms of the MIT license. Another annoying task that Moment.js has greatly simplified is date validation. What I have tried: I have tried with the below code. This method will get/set the day of the week. In order to perform validation, simply pass a date string to the moment … In the first example, we get today's date with Moment.js. It takes input from 0-6, where 0 is for Sunday and 6 as Saturday. In the following examples, a JavaScript function is used to check a valid date format against a regular expression. Date Validation. 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