Tonalpouhqui
Cuenta de los Días
Referencia calendárica: Ciudad de México
Consulta una fecha mediante las cuentas Tonalpohualli y Xiuhpohualli. El cálculo identifica el signo del día, la trecena, la veintena, sus regentes y acompañantes. Convierte la hora del lugar de nacimiento a la referencia de Ciudad de México.
Today’s calculation and its PDF export are free. A pass lets you calculate custom dates and print or save those results as a PDF.
Personal interpretation requires a separate consultation.
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Diseño e ilustraciones de los 20 signos: Cuetz G. Rodríguez.
© 2026 Cuetz G. Rodríguez.
Artwork use
Purchasing a pass grants access to the calculator; it does not grant permission to reuse the artwork. You may print or save your calendar results for personal use. Any other use of the illustrations—including merchandise, stickers, presentations, or republication—requires prior permission from Cuetz G. Rodríguez.
About Tonalpouhqui · Cuenta de los Días
Tonalpouhqui brings together Nahua calendrical knowledge, original artwork, and a digital tool for exploring the Tonalpohualli and Xiuhpohualli. Its name refers to the person who counts and interprets the days.
Developed by Cuez Media, the calculator follows the calendrical approach used in this project, drawing on teachings shared by Maestro Mesa. It identifies the day sign, trecena, veintena, year bearer, and their associated regents and companions. Birth dates and local times are converted to the project’s reference in Mexico City.
The calculator provides a detailed calendrical reading. Its results are studied in combination with the codices to interpret the meaning of the calendrical elements and their relationships. For those unfamiliar with the codices, a separate consultation offers guidance through this interpretive process. Users can also explore these relationships through their own research.
Today’s calculation and its PDF export are free. A paid pass provides access to calculations for custom dates and the option to print or save those results as a PDF. Personal consultation is a separate service.
Historical date support: consult dates back to 1521 using either the Julian or Gregorian calendar and the project’s calendrical correlation.
The twenty day-sign illustrations were created by Cuetz G. Rodríguez in 2010.
Design and illustrations of the twenty day signs: Cuetz G. Rodríguez.
© 2026 Cuetz G. Rodríguez.
Historical dates and methodology
Choose the calendar used by your source. August 13, 1521 Julian and August 23, 1521 Gregorian identify the same day. Changing the calendar selector changes how the entered date is interpreted; it does not automatically convert the numbers in the date field.
Historical reference: the project’s anchor is 1-Coatl in the year 3-Calli, during Tlaxochimaco, on August 13, 1521 Julian. The modern check is June 6, 2026 Gregorian: 9-Mazatl, year 1-Tochtli.
Time reference: before March 12, 1901, enter time directly in the project’s Mexico City reference. Birthplace time conversion is not supported for this period. This is a calculation convention, not a reconstruction of historical civil clocks. The year-bearer boundaries use the project’s fixed reference: Calli 00:43, Tochtli 06:43, Acatl 12:43, and Tecpatl 18:43.
Reading the results: Mexico City reference dates and calculated ranges—such as “Vigente desde,” “Vigente hasta,” and year boundaries—are Gregorian. An original Julian input is identified separately.
Scope of validation: the historical anchor, neighboring days, calendar conversions, and modern regression cases have been tested. This does not independently validate every historical date or field against a codex. Year starts retain the project’s existing March civil-date rule; this does not claim an uninterrupted astronomical count across Gregorian century corrections.
Use the results alongside the codices and the project’s correlation when conducting personal research or a consultation.