jquery validation for date is not accepted jan date

Question

I am facing a problem of date validation. I used following reg expression for enter date in dd-mmm-yyyy format only

dateValidatorRegex = /^(\d{1,2})(-)(?:(\(jan)|(feb)|(mar)|(apr)|(may)|(jun)|(jul)|(aug)|(sep)|(oct)|(nov)|(dec))(-)(\d{4})$/i;

But in this case when I entered date in month of jan It doesn't passes the validation. Please suggest on it.

Why the backslash before the opening parenthesis right before jan? — Frédéric Hamidi
– Frédéric Hamidi, Commented Jun 30, 2014 at 7:41
possible duplicate of Validate two dates of this "dd-MMM-yyyy" format in javascript — Sid M
– Sid M, Commented Jun 30, 2014 at 7:45

mplungjan · Accepted Answer · 2014-06-30 09:10:02Z

2

Here is an alternative to lengthy regexs which do not handle leap years

Live Demo

function isValidDate(str) {
  var d = new Date(Date.parse(str.replace(/-/g," "))), parts = str.split("-");
  var monthNum = ["jan","feb","mar","apr","may","jun","jul",
                  "aug","sep","oct","nov","dec"].indexOf(parts[1].toLowerCase());
  return parts[0]==d.getDate() && 
         monthNum == d.getMonth() && 
         parts[2]==d.getFullYear();
}

Note that the .indexOf for arrays is not compatible with older IEs so you can do

  var monthNum = {"jan":0,"feb":1,"mar":2,"apr":3,"may":4,
                  "jun":5,"jul":6,"aug":7,"sep":8,"oct":9,
                  "nov":10,"dec":11].[parts[1].toLowerCase()];

instead

edited Jun 30, 2014 at 9:10

answered Jun 30, 2014 at 8:26

mplungjan

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2 Comments

Shubh Over a year ago

Liked your Live Demo button. Keen to know where did you get hold of that. Would love to use next time :) <kbd></kbd>

mplungjan Over a year ago

I got it from here a long time ago. Some purist edit my posts to remove it. Not sure why.

mplungjan · Accepted Answer · 2014-06-30 09:07:44Z

1

The regular expression is wrong at backslash. It will be,

var dateValidatorRegex = /^(\d{1,2})(-)(?:((jan)|(feb)|(mar)|(apr)|(may)|(jun)|(jul)|(aug)|(sep)|(oct)|(nov)|(dec)))(-)(\d{4})$/i;

By that backslash jan month is not validate.

edited Jun 30, 2014 at 9:07

mplungjan

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answered Jun 30, 2014 at 8:59

sushama

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