Mayan Birth Sign Calculator

YYYY-MM-DD in the (proleptic) Gregorian calendar.
Long Count
13.0.0.0.0
Mayan Calendar Converter
Tzolk’in date
4 Ajaw
Haab’ date
3 K’ank’in
Calendar Round
4 Ajaw 3 K’ank’in
Julian Day Number
2,456,283
Days since the Long Count zero date
1,872,000 days
B’ak’tun
13
K’atun
0
Tun
0
Winal
0
K’in
0
Tzolk’in number
4
Tzolk’in day sign
Ajaw
Haab’ day
3
Haab’ month
K’ank’in
Gregorian weekday
Friday
Correlation constant used
584,283
Summary
2012-12-21 is Long Count 13.0.0.0.0, Calendar Round 4 Ajaw 3 K’ank’in.
Worked out from Smithsonian National Museum of the American Indian, "The Calendar System", Living Maya Time and 2 other sources.

How this is worked out

5 steps
  1. 2012-12-21 has Julian Day Number 2456283.
  2. Days since the Long Count zero date: 2456283 - 584283 = 1872000.
  3. Long Count: 1872000 = 13 x 144000 + 0 x 7200 + 0 x 360 + 0 x 20 + 0 = 13.0.0.0.0.
  4. Tzolk’in: number = ((1872000 + 3) mod 13) + 1 = 4; day name index = (1872000 + 19) mod 20 = 19 = Ajaw.
  5. Haab’: (1872000 + 348) mod 365 = 263, which is day 3 of K’ank’in.

Results are general information, not financial, tax, legal, medical or engineering advice.