create table test_1 (
    date timestamp,
    value smallint
);
insert into test_1 (date, value) values
('01-01-2021 12:00:00',1),
('01-01-2021 12:00:04',1),
('01-01-2021 12:00:08',1),
('01-01-2021 12:00:20',0),
('01-01-2021 12:00:24',0),
('01-01-2021 12:00:28',1),
('01-01-2021 12:00:32',1),
('01-01-2021 12:00:36',1);

select min(date), max(date) from (
select *,
       row_number() over (order by date) - row_number() over (partition by value order by date) as grp
from test_1
) t
where value = 1
group by grp;