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POHow to validate date with format "mm/dd/yyyy" in JavaScript?
 

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  1. POHow to validate date with format "mm/dd/yyyy" in JavaScript?
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    <p>I want to validate the <em>date format</em> on an input using the format <code>mm/dd/yyyy</code>.</p> <p>I found below codes in one site and then used it but it doesn't work:</p> <pre><code>function isDate(ExpiryDate) { var objDate, // date object initialized from the ExpiryDate string mSeconds, // ExpiryDate in milliseconds day, // day month, // month year; // year // date length should be 10 characters (no more no less) if (ExpiryDate.length !== 10) { return false; } // third and sixth character should be '/' if (ExpiryDate.substring(2, 3) !== '/' || ExpiryDate.substring(5, 6) !== '/') { return false; } // extract month, day and year from the ExpiryDate (expected format is mm/dd/yyyy) // subtraction will cast variables to integer implicitly (needed // for !== comparing) month = ExpiryDate.substring(0, 2) - 1; // because months in JS start from 0 day = ExpiryDate.substring(3, 5) - 0; year = ExpiryDate.substring(6, 10) - 0; // test year range if (year &lt; 1000 || year &gt; 3000) { return false; } // convert ExpiryDate to milliseconds mSeconds = (new Date(year, month, day)).getTime(); // initialize Date() object from calculated milliseconds objDate = new Date(); objDate.setTime(mSeconds); // compare input date and parts from Date() object // if difference exists then date isn't valid if (objDate.getFullYear() !== year || objDate.getMonth() !== month || objDate.getDate() !== day) { return false; } // otherwise return true return true; } function checkDate(){ // define date string to test var ExpiryDate = document.getElementById(' ExpiryDate').value; // check date and print message if (isDate(ExpiryDate)) { alert('OK'); } else { alert('Invalid date format!'); } } </code></pre> <p>Any suggestion about what could be wrong?</p>
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      1. POHow to validate date with format "mm/dd/yyyy" in JavaScript?
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    1. COWelcome to StackOverflow. You can format source code with the `{}` toolbar button. I've done it for you this time. Also, try to provide some information about your problem: a **doesn't work** description is a useful as a **then fix it** solution.
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      1. POHow to validate date with format "mm/dd/yyyy" in JavaScript?
      1. USÁlvaro González
    2. COWhat kind of date formats are you trying to validate? Can you give some example of dates that should be valid?
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      1. POHow to validate date with format "mm/dd/yyyy" in JavaScript?
      1. USNiklas
    3. COIn the format of mm/dd/yyyy.
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      1. POHow to validate date with format "mm/dd/yyyy" in JavaScript?
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