Oracle winter time change

ALTER SESSION SET NLS_LANGUAGE=english; -- First day of week
SELECT 
	NEXT_DAY(LAST_DAY(TO_DATE(TO_CHAR('01/10/' -- Last Sunday of October 02:00
        || (EXTRACT(YEAR FROM SYSDATE)-5 + level) || '02:00:00'), 
           'DD/MM/YYYY HH24:MI:SS')) - INTERVAL '7' DAY, 'SUNDAY') AS H_WINTER,
	NEXT_DAY(LAST_DAY(TO_DATE(TO_CHAR('01/03/' -- Last Sunday of March 02:00 
		|| (EXTRACT(YEAR FROM SYSDATE)-5 + level) || '02:00:00'),
		'DD/MM/YYYY HH24:MI:SS')) - INTERVAL '7' DAY, 'SUNDAY') AS H_SUMMER
FROM DUAL CONNECT BY level <=10;
-- ⇓ Test it ⇓ (Fiddle source link)

Similar codes

0 vote262 views1 answer
Difference between cross apply and inner join
SQL
0 vote251 views1 answer
Sql requete number pair
SQL
0 vote284 views1 answer
T sql cursor tr
SQL
0 vote265 views1 answer
Minus equivalent in my sql
SQL
19 votes276 views2 answers
Mysql add column after another
SQL
0 vote283 views1 answer
Sql declare variable single line
SQL
10 votes303 views4 answers
SELECT FROM WHERE
SQL
13 votes267 views4 answers
GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
SQL
4 votes330 views4 answers
Remove duplicate old value in mysql
SQL
1 vote276 views2 answers
Datetrunc hour snowflake
SQL