Incorrect time / timezone proble

[spoiler-github]

Hi,
Firstly, I'm sorry for my bad English.
Secondly... Currently, I'm trying to set up correct timezone for users that not authorized. As default it shows America/New-York as default timezone.

I had following configuration:

MariaDB [wikijs]> show columns from users like 'timezone';
+----------+--------------+------+-----+------------------+-------+
| Field    | Type         | Null | Key | Default          | Extra |
+----------+--------------+------+-----+------------------+-------+
| timezone | varchar(255) | NO   |     | America/New_York |       |
+----------+--------------+------+-----+------------------+-------+

MariaDB [wikijs]> select id,name,timezone from users;
+----+------------+------------------+
| id | name       | timezone         |
+----+------------+------------------+
|  1 | Corny      | Europe/Kyiv      |
|  2 | Guest      | America/New_York |
+----+------------+------------------+
2 rows in set (0.000 sec)

I have updated Guest user timezone to Europe/Kyiv and set the same timezone as default:

MariaDB [wikijs]> show columns from users like 'timezone';
+----------+--------------+------+-----+-------------+-------+
| Field    | Type         | Null | Key | Default     | Extra |
+----------+--------------+------+-----+-------------+-------+
| timezone | varchar(255) | NO   |     | Europe/Kyiv |       |
+----------+--------------+------+-----+-------------+-------+
1 row in set (0.001 sec)

MariaDB [wikijs]> select id,name,timezone from users;
+----+------------+------------------+
| id | name       | timezone         |
+----+------------+------------------+
|  1 | Corny      | Europe/Kyiv      |
|  2 | Guest      | Europe/Kyiv      |
+----+------------+------------------+
2 rows in set (0.000 sec)

But now I see one-hour difference between logged-in account and non-authorized.
When I log in, then it shows last edit time as 07:30, but without account it shows 06:30.

What am I doing wrong?

I see that following discussion has the same issue but don't have reply:
#6857