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Count the days of October 1582 in Rome . They go one , two , three , four . Thursday 4 October was the last day of the old calendar . The next day was Friday 15 October . Julius Caesar made the old calendar . Every fourth year was a leap year with 366 days . But the calendar year was too long , by about 11 minutes . Eleven minutes is very little . But the mistake grew every year . After about 128 years , it was a whole day . In 325 , spring began around 21 March . By 1582 , it began around 11 March . The mistake was now ten days . Pope Gregory XIII wanted to fix the calendar . So his experts cut ten days from October 1582 . They changed the leap - year rule . A year that ends in 00 is special . It is a leap year only if you can divide it by 400 . So 2000 was a leap year , but 1900 was not . Not every country changed in 1582 . Spain and Portugal changed in October . Britain changed in 1752 , and Russia in 1918 . Count October 1582 again : four , then fifteen . Ten missing days brought the calendar back to the seasons .
