Since the calendar shift was already explained, it may be fun to know that there were two revolutions in Russia in 1917, both named after the wrong month. The February revolution took place in March and the October revolution took place in November. Just as a bit of trivia.
In an illegal dismantlement forced by The West with a subsequent capitalist shock therapy in which millions died and even more millions saw their quality of life decline drastically.
I also love how these imbeciles always bring up the fact that USSR dissolved as some kind of gotcha, like see communism doesn't work I'm so intelligent. As if no capitalist regime has ever collapsed due to its internal contradictions. The reality is that every type of system has potential to fail in some way. The question that actually needs to be asked is how well the system functions while it's working as intended.
USSR managed to provide everyone with things like food, housing, education, and healthcare. Nobody in USSR worried that they'd lose their job and end up on the street or that they couldn't retire in dignity. These are basic things that no capitalist regime is able to accomplish today. These are real tangible rights and freedoms that USSR ensured for its people.
Yep, with a reactionary coup, because a non-capitalist alternative was just too threatening. One of the biggest tragedies of the 20th century, for reasons already briefly detailed in other comments here.
The October revolution? Yeah, we do know how that ended. Or are you talking about how a state that did not yet exist at the time ended close to 80 years later, when the revolutionaries themselves were all dead and buried? Cause if we are bringing all subsequent generations into this I guess we all know that it simply did not end.