select
current_date,
datediff (year from date '2023-01-01' to current_date),
dateadd (datediff (year from date '2023-01-01' to current_date) year to date '2023-01-01')
from rdb$database;
select
current_date,
datediff (day from date '2023-01-01' to current_date),
dateadd (datediff (day from date '2023-01-01' to current_date) day to date '2023-01-01')
from rdb$database;