How to get first and last day of week in Oracle?

WEEK

select TRUNC(sysdate, 'iw') AS iso_week_start_date,
       TRUNC(sysdate, 'iw') + 7 - 1/86400 AS iso_week_end_date
from dual;

MONTH

select 
TRUNC (sysdate, 'mm') AS month_start_date,
LAST_DAY (TRUNC (sysdate, 'mm')) + 1 - 1/86400 AS month_end_date
from dual;
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