By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
select
date('0001-01-01') + year(current date) years - 1 year first_day_of_the_year,
date('0001-01-01') + year(current date) years - 1 day last_day_of_the_year
from sysibm. sysdummy1
| FIRST_DAY_OF_THE_YEAR | LAST_DAY_OF_THE_YEAR |
|---|---|
| 2020-01-01 | 2020-12-31 |