Title: Mayanism
Content:  The significance of this date in Mayanism stems from the ending of the current baktun cycle of the Maya calendar in 2012, which many believed would create a global "consciousness shift" and the beginning of a new age. This has come to be known as the 2012 phenomenon. Speculation about this date can be traced to the first edition of The Maya (1966) by Michael D. Coe, in which he suggested the date of December 24, 2011 as one on which the Maya believed "Armageddon would overtake the degenerate peoples of the world and all creation.". This date became the subject of speculation by Frank Waters, 
Title: Mesoamerican Long Count calendar
Content:  in 2012. USA Today writes For the ancient Maya, it was a huge celebration to make it to the end of a whole cycle,' says Sandra Noble, executive director of the Foundation for the Advancement of Mesoamerican Studies in Crystal River, Florida. To render December 21, 2012, as a doomsday event or moment of cosmic shifting, she says, is 'a complete fabrication and a chance for a lot of people to cash in. "There will be another cycle," says E. Wyllys Andrews V, director of the Tulane University Middle American Research Institute (MARI). "We know the Maya thought there was one before this, and that implies they were comfortable with the idea of another one after this."
Title: AD 150
Content: The Middle Culture period of Mayan civilization ends (approximate date). ; The Great Pyramid of the Sun is constructed in Teotihuacan. It is the tallest pre-Columbian building in the Americas. 
Title: 2012 phenomenon
Content: The number 13 plays an important role in Mesoamerican calendrics; the tzolkʼin, or sacred calendar, was divided into 13 months of 20 days each. The Mayan may cycle consisted of 13 kʼatuns. The reason for the number's importance is uncertain, though correlations to the phases of the moon and to the human gestation period have been suggested. ; The Mayan calendar, unlike the Western calendar, used a zero. ; Rather than "0.0.0.0.0", the Mayan Long Count represented the date of creation as "13.0.0.0.0" ; Most Mayanist scholars, such as Mark Van Stone and Anthony Aveni, adhere to the "GMT (Goodman-Martinez-Thompson) correlation" with the Long Count, which places the start date at 11 August 3114 BC and the end date of bʼakʼtun 13 at 21 December 2012. This date was also the overwhelming preference 
Title: History of calendars
Content:  known as Uayeb, and was considered a time which could hold danger, death and bad luck. The Vague Year began with the month of Pop. The Maya 20-day month always begins with the seating of the month, followed by days numbered 1 to 19, then the seating of the following month, and so on. This ties in with the Maya notion that each month influences the next. The Maya new year would start with 1 Pop, followed by 2 Pop, all the way through to 19 Pop, followed by the seating of the month of Uo, written as 0 Uo, then 1 Uo, 2 Uo and so on. These two cycles coincided every 52 years. The 52-year period of time was called a "bundle" and was similar to a modern-day century.
Title: Apocalypticism
Content:  December 2012 would mark the beginning of a new era. Others suggested that the date marked the end of the world or a similar catastrophe. Scenarios suggested for the end of the world included the arrival of the next solar maximum, an interaction between Earth and the supermassive black hole at the center of the galaxy, or Earth's collision with a mythical planet called Nibiru. Scholars from various disciplines quickly dismissed predictions of concomitant cataclysmic events as they arose. Professional Mayanist scholars stated that no extant classic Maya accounts forecast impending doom, and that the idea that the Long Count calendar ends in 2012 misrepresented Maya history and culture,  while astronomers rejected the various proposed doomsday scenarios as pseudoscience,  easily refuted by elementary astronomical observations.
Title: 2012 phenomenon
Content:  The 2012 phenomenon was a range of eschatological beliefs that cataclysmic or transformative events would occur on or around 21 December 2012. This date was regarded as the end-date of a 5,126-year-long cycle in the Mesoamerican Long Count calendar, and festivities took place on 21 December 2012 to commemorate the event in the countries that were part of the Maya civilization (Mexico, Guatemala, Honduras, and El Salvador), with main events at Chichén Itzá in Mexico and Tikal in Guatemala. Various astronomical alignments and numerological formulae were proposed for this date. A New Age interpretation held that the date marked the start of a period during which Earth and its inhabitants would undergo a positive physical or spiritual transformation, and that 21 
Title: Maya calendar
Content:  Count was particularly well suited to use on monuments. The monumental inscriptions would not only include the 5 digits of the Long Count, but would also include the two tzolkʼin characters followed by the two haabʼ characters. Misinterpretation of the Mesoamerican Long Count calendar was the basis for a popular belief that a cataclysm would take place on December 21, 2012. December 21, 2012 was simply the day that the calendar went to the next bʼakʼtun, at Long Count 13.0.0.0.0. The date of the start of the next b'ak'tun (Long Count 14.0.0.0.0) is March 26, 2407. The date of the start of the next piktun (a complete series of 20 bʼakʼtuns), at Long Count 1.0.0.0.0.0, is October 13, 4772.
Title: 909
Content: The last Long Count date is inscribed on a monument at the Mayan site of Toniná (modern-day Chiapas, Mexico), marking the end of the Classic Maya Period. 
Title: Mesoamerican calendars
Content:  Since both the 260-day and the 365-day calendar repeat, approximately every 52 years they reach a common end, and a new Calendar Round begins. This 52-year cycle was the most important for most Mesoamericans, with the apparent exception of the Maya elite until the end of the Classic Era, who gave equal importance to the long count calendar. According to their mythology, at the end of one of these 52-year cycles the world would be destroyed by the gods, as it had been, three times in the Popul Vuh and four times for the Aztecs. While waiting for this to happen, all fire was extinguished, utensils were destroyed to symbolize new beginnings, people fasted and rituals were carried out. This was known as the New Fire Ceremony. When dawn broke on the first day of the new cycle, torches were lit in the temples and brought out to light new fires everywhere, and ceremonies of thanksgiving were performed.

Question: when does the mayan calendar end exactly?
Answer: 2012.