Bug 70998 – Date constructor handles infinite values incorrectly.

• Component: JavaScriptCore
• Status: RESOLVED FIXED

For cases in which the time value of a Date object is not a finite number, Date.prototype.toISOString() should throw a RangeError exception. This can either be reproduced by several Test262 test cases (i.e. 15.9.5.43-0-*) or with the following JavaScript snippet.

function test() {
  var date = new Date(Infinity, 1, 70, 0, 0, 0);
  try {
    date.toISOString();
    return false;
  } catch (e) {
    return e instanceof RangeError;
  }
}

[Alexey Proskuryakov]

Sounds much like bug 70394, but still happens in ToT.

[Sam Weinig]

(In reply to comment #1)
> Sounds much like bug 70394, but still happens in ToT.

It is a different code path due to the Data constructor having different defined behavior when passing one argument, and two or more.

[Gavin Barraclough]

To clarify Sam's comment, the issue re RangeErrors was fixed last week, in bug #70394 - the bug here is different.

The problem is not in toISOString, but rather in the call to new Date.  The test case assumes that the newly constructed Date has a NaN internal value; the bug is that it does not.  You can demonstrate that toISOString behaved correctly by changing the arguments to new Date to ("") (which does correctly produce a Date with a NaN internal value).

Retitling the bug accordingly.

[Gavin Barraclough]

Fixed in r104267