As a matter a fact, you can not
the Aztec calendar is the most perfect in the world
That would defeat the purpose. The goal is to make the length of the calendar year as close as possible to the length of the mean tropical year, which is the average time it takes the earth to go from a certain point in its orbit of the sun, let's say for example the vernal equinox, around the sun and back to that same point again. The problem is that calendar makers only work with whole days, but the mean tropical year is not a multiple of a whole day. It is approximately 365.2422 days. The solution is to give some calendar years 365 days and to give about 24.22% of calendar years 366 days, so that the average days per calendar year ends up being 365.2422 days, the same as the actual tropical year. Actually, in the Gregorian calendar, 24.25% of all years have 366 days. It's not perfect, but it's about 25 times more accurate than the Julian calendar, in which 25% of all years have 366 days.
Calendar days are every day on the calendar, including weekend days, weekdays, business days and holidays. So, for example, 10 calendar days after the 4th of a month is the 14th of the same month.
Calendar Days was created on 2003-02-08.
The Mayan calendar belongs to the Mayan civilization, which thrived in Mesoamerica (present-day Mexico and Central America) from around 2000 BC to 900 AD. The calendar was a complex system that included multiple cycles of time, such as the Haab (365 days) and the Tzolk'in (260 days).
December has 31 days in the Gregorian calendar, as that is the calendar that we now use.
"I'm afraid for the calendar. Its days are numbered."
30 calendar days is 30 days including weekdays, weekends and holidays.
The Mayan calendar system is complex and consists of multiple calendars. The Long Count calendar, which is one of the Mayan calendars, spans over 5,000 years. It is a linear count of days since a mythical creation date.
Calendar: days
The Julian calendar is 13 days behind the Gregorian calendar from March 1900 until March 2100.
Due to its dependance on the lunar movements, the Hijra calendar year is a shorter than the Gregorian calendar by about ten days which means that there are usually 355 days in a Hijra calendar.