hmm, something is messed up in the issue report @lwelti, make sure you use triple ` to enclose code.

check again, i removed the script tags, but if this is really an issue we are in trouble.

It looks like this affects all es- locale data, because there's literal strings that I missed in the date format mappings, e.g. "full": "EEEE, d 'de' MMMM 'de' y".

I didn't account for this, and the intl402 tests don't test for it either, so it got missed. I'll try and get it fixed this morning if I have a bit of free time.

that only solves one issue, but is still wrong in some formats.

Using Intl Object:
var options = {weekday: "long", year: "numeric", month: "long", day: "numeric"};
document.write(new Intl.DateTimeFormat(lang, options).format(date));

returns:
lunes 8 de febrero de 2010

Using IntlPolyfill:
var options = {weekday: "long", year: "numeric", month: "long", day: "numeric"};
document.write(new IntlPolyfill.DateTimeFormat(lang, options).format(date));

returns:
lun, 8 de febrero de 2010

All the week formats, return the same value:

lun, 8 de febrero de 2010

var options = {month: "long"};
document.write(new IntlPolyfill.DateTimeFormat(lang, options).format(date));

returns:
feb 2010

instead of:
febrero

@lwelti: see my reply to your new issue, #40.