Reference The Mayan CalendarsAll calendars are the same: they count cycles in days! 
The classic Mayans used more then 20 different calendars! Before we go and examine the calendars, we need to understand their time units.Starting with the smallest unit which is a KIN(Day), their system went on to count time back to the Big Bang...!

The nine Mayan Calendars (click here) The magic Tzolkin Calendar: This is really the smallest time span covered by a mayan calendar. It is composed of 13 uinals(units of 20 days) for a total of 260 days.This calendar is the unifying, common pulse of all calendars and is syncronized with all other cycles.The Tzolkin is counting uninterrupted a time span called the GREAT CYCLE. This is the complete duration of the National cycle including the planetary,galactical and the universal cycle. The GREAT CYCLE started Aug. 11 3114 BC and finishes Dec.21 2012 or it started Jun. 17 3115 BC and finishes Oct.28 2011. The Haab Calendar: This is composed of 18 months of 20 days plus one month of five days. Creation Schedule: The real value of the Mayan calendars reveals only after relating the exponential longer time spans of the other cycles. Fractal! Each 13th element contains all 13 elements of the next smaller cycle in it. There are three possible end dates: Oct.28.2011, most likeley Dec.21 2012 or Dec.23 2012 
days 6 nights  1  2  3  4  5  6  7  8  9  10  11  12  13 
13???.gap 
1 CELLULAR CYCLE
 
16.4BY  15.14BY  13.88BY  12.61BY  11.35BY  10.09BY  8.83BY  7.57BY  6.31BY  5.04BY  3.78BY  2.523BY  1.28BY  
13cell.gap 
1MAMMALIAN CYCLE
 
1.28BY 
820MY  757My  694My  631My  568MY  505My  441MY  378My  315MY  252My  189My  126My  63MY 
13mam.gap 
1FAMILIAN CYCLE  
63MY 
41MY  37.8My  34.7My  31.5My  28.4MY  25.2My  22.1MY  18.9My  15.8MY  12.6My  9.4M  6.3My  3.2MY 
13fam.gap 
1TRIBAL CYCLE
 
3.2MY3.2MY 
2.05MY  1892Ty  1735Ty  1577Ty  1419TY  1261Ty  1104TY  946Ty  788TY  630Ty  473Ty  315Ty  157TY 
13tri.gap 
1CULTURAL CYCLE
 
157TY 
102Ty  93420y  85635y  77850y  70065Y  62280y  54495Y  46710y  38925Y  31140y  23355Y  15570y  7785Y 
13cul.gap 
1NATIONAL CYCLE
 
7785Y 
5122y  4728y  4334y  3940y  3546Y  3152y  2758Y  2364y  1970Y  1576y  1182Y  788y  394Y 
13nat.gap 
1PLANETARY CYCLE
 
394Y 
256.1y  236.4y  216.7y  197y  177.3Y  157.6y  137.9Y  118.2y  98.5Y  78.8y  59.1Y  39.4y  19.7Y 
13pla.gap 
1GALACTIC CYCLE
 
19.7Y 
13y  12y  11y  10y  9y  8y  7y  6y  5y  4y  3y  2y  1y 
13gal.gap 
1UNIVERSAL CYCLE
 
360D 
260D  240D  220D  200D  180D  160D  140D  120D  100D  80D  60D  40D  20D 
13uni.gap 
1??? CYCLE  
20D 
13D  12D  11D  10D  9D  8D  7D  6D  5D  4D  3D  2D  1D 
Book of Revelation 21:4: The book of Chilam Balam of Tizimin: What about that? Any comments are welcome! 
Created on ... November 22, 2002