Roth 5 year rule

I need clarification on the 5 year rule. I took a Roth distribution which included the principal and interest earnings. The Roth IRA was opened in April 2017 and designated for the 2016 tax year, therefore I believe that the 5 year clock starts ticking on Jan1 2016 and the 5 year requirement has been met as of Jan 1 2021, and the interest is not taxable.  Do I have this correct?

Thanks!