pretty cool, you guys and gals should check it out:

http://www.azteccalendar.com/calendar-calculator.html

March 29, 1989 yields:

Solar year: The protector of day Calli (House) and the provider of the Shadow Soul or Tonalli is Tepeyollotl, Heart of the Mountain. Calli is a good day for rest, tranquility and family life. Not a good day for participating in public life. Best spent cementing relationships of trust and mutual interests.


13-day period: The 13-day period Miquiztli (Death) is ruled by Tonatiuh. This trecena signifies the vast cosmological forces at play in the lives of human beings. These 13 days are all influenced by transformative powers of unknown dimension, origin and intent. The days of this trecena often pass by unnoticed since they are not remarkable until the elementals turn their attention to this place, the first of the thirteen skies; when this occurs, though, the whole of the world changes. It is during these days that the song of the Old Ones may best be heard. These are good days to fulfill old obligations; bad days to go back on one's word.


Day: The protector of day Malinalli (Grass) and the provider of the Shadow Soul or Tonalli is Patecatl. This day signifies tenacity, rejuvenation, that which cannot be uprooted forever. Malinalli is a day for persevering against all odds and for creating alliances that will survive the test of time. It is a good day for those who are suppressed, a bad day for their suppressors.


Type in December 21, 2012 for kicks.