For years between 30 to 39 AD you say: 30's
For years between 20 to 29 AD you say: 20's
For years between 10 to 19 AD you say: 10's
But what about the years between 0 to 9 AD?
Is it 0's?
There was no 0AD, the years went straight from 1BC to 1AD.
We don't refer to the years of the first century like this. We don't call the years 20AD-29AD as the twenties. If we ever do refer it, we would say something like "the third decade of the first century". So 1AD -10AD would be "the first decade". Perhaps you could use "the first decade of the common era."
We do talk about the years 1920-1929 as the "twenties", and so on. There is no generally agreed on abbreviation for the years 2000-2009 and 2010-2019. Though the "aughts" and "noughties" has been proposed for 2000-2009
Here is a comic about this