Output in Browser: Date follows dd/mm/yy format Var date_regex = /^(0|1)\/(0|1\d|2\d|3)\/(0|1|2)$/ ĭocument.getElementById("message").innerHTML = "Date follows dd/mm/yy format" ĭocument.getElementById("message").innerHTML = "Invalid date format" Using these expressions, we can validate the date in dd/mm/yy format in JavaScript. Each symbol or expression in a regular expression has its own meaning. The only issue that many people face when it comes to regular expressions is the difficulty in understanding them as they contain various symbols and numbers. Regular expression is a great way of validating date. Validate Date Using Regular Expressions in JavaScript At last, we use the isValid() function to check whether the input date is valid or not and returns a boolean value of true if the input date matches the format dd/mm/yy and false if the input date doesn’t match the format specified. The strict parsing requires that the format and input match exactly, including delimiters. The moment function takes three parameters as an input the first one is the input date that we want to validate, the second one is the format that we want our date to follow, and the last parameter is optional if it is set to true then it will use the strict parsing. Below is the code to validate a date with moment.js in JavaScript. Then we can directly use the moment() method available in the moment.js library. To use this library, we first have to download it using the below command. We will use this library for validating and displaying dates in JavaScript. The moment.js library is the best and easiest way of validating and formatting dates and times in JavaScript. Validate Date With the moment.js Library in JavaScript This article will introduce how to validate the date in mm/dd/yy format in JavaScript. We have to follow a particular format while validating dates in our web application so that later it becomes easier for us to work with the date. Validating a date becomes important to validate dates in JavaScript because various people at various locations follow different formats while entering dates.
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