Aztec and Maya Calendar
In the tonalpohualli, the sacred Aztec calendar, Tuesday January 8, 1516 is:
Xihuitl:
solar year
10 - Acatl (reed)
Long Count:
Mayan calendar
11.14.15.15.1
Xiuhpohualli:
365-day calendar
8 - Tititl (XVIII)
(Correlation: Alfonso Caso [adjust])
The significance of this day
Aztec facts
In the years after the conquest of Mexico, the xiuhpohualli (solar calendar) became tied to the Julian calendar as used by the Spaniards. This effectively introduced a leap year to the Aztec calendar every four years (this site provides the pre-conquest calendar).
Day Cipactli (Crocodile) is governed by Tonacatecuhtli, Lord of Nurturance, as its provider of tonalli (Shadow Soul) life energy. Cipactli is an auspicious day, signifying advancement and honor. It depicts energy and work, rewards and recognition. A good day for beginnings.
The thirteen day period (trecena) that starts with day 1-Ozomahtli (Monkey) is ruled by Patecatl. The 13 days of this trecena are influenced by the quest for cures of all the various ills that befall us: the quest to obtain power that can overcome misfortune lies at the heart of the warrior's purpose. The transformation of poison into medicine, and evil into good, is an art whose expression must be tailored to the field of battle. These are good days to fashion a war shield and collect articles for your medicine bundle; bad days to allow infections to fester.

