González Cortés
What it is
Caso's count moved by exactly one day, to hold Chimalpahin's record, with the day starting at dawn rather than midnight.
Why it does not fit the others' formula
Its author is Raúl González Cortés, of «El blog del Tonalpohualli». Not to be confused with Francisco Rodríguez Cortés, the Chiapas calendar keeper whose count other sites use.
The algorithm
The full algorithm for this count lives as a file of its own, kept outside the code and sealed, so that it outlives the app and so that whoever inherits it knows what to implement.
What is published here is its data sheet — the anchor, the offset, when the day starts and when the year opens — and its control dates, which is what lets anyone check whether a calculation is right.
How to cite this page
Alma Mexica, «González Cortés», The five counts. Last revised 2026-09-17. https://almamexica.org/en/counts/gonzalez-cortes/