On the contrary, it's very easy to tell. Just look at the date filed. Late registrations are filed 30 days or more after the birth. See here:
http://gen.doh.hawaii.gov/sites/har/AdmRules1/8%208A%20B%20VR%20Admin%20Rules.pdf
Hence if the date filed is within a few days of the birth, as in Obama's case, you know with certainty that the registration wasn't late.
You are making an assumption. For late filed registrations there is no proof of date of birth. There is merely a witness signature. So the date can’t be assumed to be in reality what is stated on the form.
With a year’s leeway the date could be off by MONTHS. You really are just that gullible aren’t you?
Still going to bat for your man, Obama. Why, if the COLB is authentic, did it appear first on DU? It did you know. After it was pointed out that it lacked a raised seal, one was photo shopped onto the same DU image. And yet it’s good enough for you. Funny, you believe anything and everything the Obama camp puts out. If Salon says it, it must be true, right?