The Codex Azoyú has 38 sheets, each one of them with a chronology indicated on the right side and on top of the sheet, each chronology is read from bottom to top and from right to left . Each sheet records 7 years, which are framed in a different square each year, the sum of all the years recorded in the 38 sheets equals 266 years.

It is considered that the calendar in the Azoyú codex shares the same structure of different Mesoamerican calendars.

The difference in days between each frame is 365 days.

And the difference of the calendar we use today, with the one written in the Azoyú codex is that the years are named after a symbol that is accompanied by a number instead of only a specific number, which is used in the Gregorian calendar.

The combination of a symbol with a determined number cannot be repeated.