What is the correct way to refer to this year? Is it "two thousand and ten" or is it "twenty ten". Thanks.
2010
That's true. There's no consensus on usage yet, and there's no basis to say that either form is incorrect.
I would probably say "two thousand ten", myself, but I would permit "two thousand and ten" as well as "twenty-ten".
If you split 2010 into two groups of two digits each, then the first group (20) is twenty and the second group (10) is ten. Numbers are often read this way in English, especially for years.
I really don't think there is an incorrect way of saying 2010. It's just a matter of personal opinion.
<<what is twenty referring for? 20th century or what.>>
No, it's actually the 21st century, not the 20th century.
No, it's actually the 21st century, not the 20th century.
I like "twenty ten" and especially "twenty twenty" for 2020. "twenty twenty" for 2020 sounds cool.