Depends on which country you are in. Many countries financial years run April to April.
Re:The Ethereum merge is done
by tsimionescu on Thursday September 15, 2022 @07:14AM
(#32850039)
More precisely, it depends whether Q3 2022 meant calendar 2022 or financial 2022 (and if the second, which financial 2022). But for an international project, I suspect the right reading is Q3 of calendar 2022.
Q2: April, May, June
Q3: July, August, September
Q4: October, November, December
Edit: https://en.wikipedia.org/wiki/Calendar_year