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Some days were added to certain months, and the total number of days in the year went to 365 from 354. Every fourth year was made a leap year, with an extra day in one month. But there was still a discrepancy between the true year and the Julian calendar year.
In the Gregorian calendar, we have seven days of the week and, depending on the month, anywhere from 28 to 31 days. The Tzolk'in calendar is made up of a set of 20 day names, symbolized by images called glyphs, and 13 numerals called tones. The days are numbered one through 13, and the names are also given in sequence.