The Mayan calender, a really complicated way to tell time...

The Mayan Calender was divided into two calenders. The first calander, the Tzolk'in is a 260 day calender. The Haab is a 365 day calender (1 solar year). 52 Haabs is a calender round or 1 cycle.

1 week is 13 days based on the Tzolk'in calender. This is called 1 Trelena.
1 month is 20 days based on the Haab calender. This is 1 Veintena.

Each day of Veintena (the month) is named:

1. Imix
2. Ik
3. Ak'Bal
4. K'an
5. Chikchan
6. Kimi
7. Manik
8. Lamat
9. Muluk
10. Oc
11. Chuen
12. Eb
13. B'en
14. Ix
15. Nem
16. Kib
17. Kab'An
18. Etz'Nab
19. Kawak
20. Ajan

The 13 days of a week cycle as well:

1. Imix
2. Ik
3. Ak'Bal
4. K'an
5. Chikchan
6. Kimi
7. Manik
8. Lamat
9. Muluk
10. Oc
11. Chuen
12. Eb
13. B'en
1. Ix
2. Nem
3. Kib
4. Kab'An
5. Etz'Nab
6. Kawak
7. Ajan
8. Imix
9. Ik
10. Ak'Bal
11. K'an
12. Chikchan
13. Kimi
1. Manik
2. Lamat
3. Muluk
4. Oc
5. Chuen
6. Eb
7. B'en

And so on. The complete cycle (every number and name combination) takes 260 days. The year starts on the winter solstice.

There are 18 months of 20 days each in the Haab (solar year) and a 5 day month at the end of the year known as the Wayab (Nameless Days).

1. Pop
2. Uo
3. Zip
4. Zotz
5. Tzel
6. Xul
7. Yazkin
8. Mol
9. Chen
10. Yax
11. Zac
12. Ceh
13. Mac
14. Kankin
15. Muan
16. Pax
17. Kayab
18. Cumku
19. Wayab - During the 5 Nameless Days of Wayab the portals between the Mortal Realm and the Underworld dissolves. No boundries prevent the ill-intending deities from causing disasters. This is a time of fear, prayer, and staying secured behind locked doors.

Each day is Identified by the day number or name followed by the name of the month. For example, 1 Pop or Imix Pop.

The Haab repeats every 52 years. This makes dating things hard. There are no names for the years or cycles. The way things are dated is my Long Count.

1 Day = 1 Kin
20 Days = 20 Kin = 1 Uinal
360 = 18 Uinal = 1 Tun = 1 Solar Year (Haab) = 1 Tun
7,200 = 20 Tun = 1 Katun = 20 SY = 20 Tuns
144,000 = 20 Katun = 1 Bactum = 395 SY = 400 Tun

Dates are arranged from the largest block time to the smallest. 4 Katuin 2 Tun 6 Uinal 3 Kin = 576,843 days ago. This equates to just over 554 Cycles.

This arrangement would work much better if the Calender Rounds or Cycles were also named. I would go with 10 Cycles (520 Years) and name each. This would allow Cycles to repeat but also allow accurate records to be kept. If the Cycle of the Dragon was three Cycles ago, you still have a good starting point.

There are 1,040 days in a Cycle. 936 Months. Multiplied by 10 is 10,400 Days and 9,360 Months. That's a long time if you are trying to look up something. Just sayin' ...

Venus was tracked and had it's own 584 Day Calender. Venus was used to divine such things as Coronations and Auspicious times to start a War.

The Lunar Series is a half-year calender used to keep track of the different phases of the moon.

So now you know, and that's half the battle.