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Tip of the Day
Language: Web
Expertise: Intermediate
Jul 30, 2002



Application Security Testing: An Integral Part of DevOps

Validate the Date Using JavaScript Regular Expressions

Regular Expressions provide a very powerful and easy method of client side validation. They are also both supported by IE and Netscape. It takes a lot less code, and works on every browser. Here's a simple date validation in Javascript—using regular expressions.
function validateDate(input)
  var datePattern = /^(\d{2})\/(\d{2})\/(\d{4})$/;
    alert("Error... please enter date in mm/dd/yyyy format");
    return false;
  var month = parseInt(RegExp.$1);
  if(month <=0 || month > 12)
    alert("Error.. invalid month");
    return false;
  var year = parseInt(RegExp.$3);
  var daysArray = new Array(31,28,31,30,31,30,31,31,30,31,30,31);
  if(year % 4 == 0)
    daysArray[1] = 29;
  var date = parseInt(RegExp.$2);
  if(date <=0 || date > daysArray[month-1])
    alert("Error... invalid date");
    return false;
  return true;
Ruchi Dhar
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