- Haab': 365-day solar calendar which included 18 months of 20 days each with an additional period or 5 "unlucky" days at the end, called Wayeb.
- Tzolkin: 260-day sacred calendar, often combined with the civil calendar to pinpoint precise timing of sacred rites, important ceremonies, agricultural or hunting plans. It involved alternating 20 day signs and thirteen numbers. Its cycle takes a total of 18980 days in combination with Haab', to make up what is known as a Mayan century. Tzolkin is still utilized nowadays to plan significant and auspicious dates for traditional events and ceremonies across Maya region villages. For example, a specific day may be viewed as especially opportune to initiate work projects, perform weddings, conduct spiritual rituals, name newborn infants, ask elders and ancestral guardians for advice and guidance