Improbable dates are typical of all the documents that José Marco claimed to have discovered. The presumed author of Leyendes, José María Pavón, translated the Code of Kalantiaw and five other pre-Hispanic documents, but he did not explain how he had calculated their dates.
Maraming mga petsang di-kapani-paniwala sa mga kasulatan na natuklasan umano ni José Marco. Isinalin ng di-umano'y may-akda ng Leyendes, si José María Pavón, ang Kodigo ni Kalantiaw at lima pang sulating pre-Hispanic, ngunit hindi niya ipinaliwanag kung paano niya kinalkula ang mga petsa ng mga ito.