Enter your date of birth to find your place in the Tonalpohualli — the 260-day Aztec sacred calendar of twenty day signs and thirteen numbered tones, each watched over by its own patron deity.
An honest note: the Tonalpohualli shares its underlying 260-day structure (20 day signs × 13 numbers) with the Maya Tzolk'in — both descend from a common, genuinely ancient Mesoamerican calendrical tradition. This calculator aligns the two systems using the same widely-used GMT correlation (584283) that anchors the Maya Long Count, following the day-sign order most commonly published for the Tonalpohualli. The exact historical correlation between the Aztec calendar and the Gregorian calendar is a genuinely unresolved scholarly question — different specialists propose different correlations, and results here can shift by a few days depending on which one is used. Treat this as one widely used interpretation, not a single verified answer.