That is how humans do it.
See this article

https://www.usnews.com/news/health-news/articles/2024-03-11/four-years-after-coronavirus-was-declared-a-pandemic-where-does-long-covid-stand

or for instance FF7 anniversary of 25 years was in 2022

https://finalfantasy.fandom.com/wiki/Final_Fantasy_VII_25th_Anniversary

But 2022 was pedantically NOT the 25th but the 24th

It came out in October 2, 1997 internationally and September 1997 in Japan

But if you rounded, then yes 2022 was the 25th year

Why round? Because it is easier to count the years: 0 1 2 3 4 5
That is 5 numbers

Than to count the exact days and spanide by 365 where we find we are months beyond 4 years making it 5 years since because we went over.

Entering the Fifth Year of the Coronavirus, Where Does Long COVID Stand?
Much has changed since the World Health Organization first called COVID-19 a pandemic four years ago today. As the U.S. enters its fifth year with the coronavirus, vaccines are available and have been updated to more closely match the spreading variants.

Quatatines begain about March 2020
2021
2022
2023
2024

count the lines
1
2
3
4
5

I take you are not a programmer?