Is 2020 the Start of a New Decade?

There's a lot of fake news going around and I want to know who's right. People argue like, does the new decade start beginning of 2020 or end of 2020? But you tweeted like a thing of the decade? And it's that incredible video of Tom Holland doing lip sync battle on television as Rihanna. So everyone expected me to be on their side. It was very similar to what happened at the millennium. There were a lot of people going, Oh, technically the millennium doesn't start until the beginning of 2001. Maybe it was too soon.