people are going to be stupid for no reason
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"I've seen this so many times in the last couple days, but it's not really accurate. It is true that there's no leap day in the Mayan solar calendar. However, this is not the calendar that some people are using to predict the end of the world; the Mayans used a long-count calendar for extremely long periods of time. The concept of leap-years is irrelevant to this calendar system, because it's not based on solar years, simply on math.
You know how we use a base-10 counting system? (10, 100, 1000, 10,000 etc.) The Mayans used a modified base-20 counting system for keeping track of days - the second cycle went up to 18 rather than 20. So they tracked days in cycles of 20, 360, 7200, 144000, 2880000, etc.
We're coming to the end of one of the 144,000 day cycles. Today (March 6, 2012) can be expressed at 12.19.19.3.10. This calendar will reach 12.19.19.17.19 on December 20, and then turn to 13.0.0.0.0 on December 21."