I am not sure who could help me for the question, but I would be appreciated if someone could help me.

Regarding the reading of year, may I know how to read it if the thrid number is 0(Zero)?

For example: 1809, we usually read it eighteen 0 nince.

But I am not sure how to read the third number 0 here, is it read the letter "U" or zero?

I hope that I can get your feedback soon.

Thank you in advance.