Issue with JavaScript Date.parse function not functioning as expected

I have implemented a date validation method in my application to check if a given date is valid or not.

myApp.isValidDate = function(date) {
  var timestamp;
  timestamp = Date.parse(date);
  if (isNaN(timestamp) === false) {
    return true;
  }
  return false;
};

While the method works correctly in most cases, I encountered an issue when entering a value like "something.com Eq Phone 1". Despite this input, Date.parse returned 978300000000 and the method still returned true.

I am puzzled by how it managed to parse this unconventional string as an actual date.

javascriptdatedate-parsing

Answer №1

The way different browsers interpreted the code was inconsistent. While IE9 and FireFox returned `Nan` as expected, Chrome mistakenly identified `something.com Eq Phone 1` as January 1st, 2001.

Although I haven't personally used this library, you might want to explore DateJS. When I tried inputting `something.com Eq Phone 1` into their demo, it did not recognize it as a valid date.

Edit:

To understand why this discrepancy occurs, studying the date parsing source code from Chromium reveals these comments:

Any unrecognized word before the first number is ignored.

And

MM and DD defaults to 01 if missing

mm, ss, and sss default to 00 if missing

This explains how the number 1 got treated as a valid date in the conversion process.

Edit 2:

Further investigation shows that the digit in `something.com Eq Phone 1` seems to represent the month. For instance, changing the `1` to `3` results in March 1, 2001.

Currently, there isn't concrete evidence suggesting that the default year is always set to 2001.

Answer №2

There seems to be a peculiar issue with how Chrome handles the parse.date function, as illustrated in this example:

http://jsfiddle.net/feZ9P/1/

"something.com" is false
"something.com is invalid" is false
"something.com eq phone" is false
"something.com eq phone 1" is true
"something.com eq phone 5" is true
"anything that has one at the end 1" is true
"as long as 1 isn't earlier in the string 1" is false

This anomaly appears to arise only when there is a numerical value attached at the conclusion of the string; in cases where no such number exists, the error does not manifest.

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