dating system awry

I hear a lot of people blaming global warming for how late the rainy season has come/stayed this year. I reckon global wamring is a farce. Instead, it is due to a faulty Roman dating calendar system. They buggered up when postulating that a year's cycle had 365 days in it. So, I reckon they're at least 1 days short, which explains why our seasons are awry ... after a couple thousand years, summer will seem later and winter later as well.