The 365-day solar calendar, divided into 18 months of 20 days. Each month is divided into four five-day weeks
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They didn't have months as such, like periods based on the lunar cycle. Within their year they had periods of about 20 days, which would be the closest idea of a month. There were 18 of these periods, so you could say that they had 18 months in their year.
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The Aztecs were known for their vast understanding of numbers and for contributing a calendar.
The Chinese lunar calendar does not use months, rather divisions. The Chinese lunar calendar has 24 divisions in a year.
The Roman Calendar has 10 months in its system. Among these ten months, there were 304 days. This has been expanded on to 12 months and 365 days, which is still used today.