The Wikipedia entry on the Gregorian calendar is full of interesting historical facts. For instance, did you know that in three years two countries had February 30ths? What's more, Friday is more likely to be on the 13th of a month than any other day because 688 out of the 4800 months in a 400-year Gregorian cycle begin on a Sunday. Speaking of which, the days and dates of 2005 exactly match up with those of 1605... in the Catholic countries that were punctual adopters of the Gregorian calendar, anyway.
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The Philippines is missing a day from their calendar. It's because when they were colonized by the Spanish, they kept their date logs based on the dates the Spanish had-- but the Spanish had crossed what is now the International Date Line. When the Spaniards returned to Spain, they discovered that their logs and the calendars in Spain were off by a day, but they just assumed it was due to sloppy record-keeping. But the Philippines kept the faulty calendar, until the situation was corrected in 1844. They just got rid of December 31 that year.