postgresql to_char(date, 'day') get different result when using nodejs - node.js

Question

UPDATE 2
Using the suggestions from #Bergi, I added a db execution helper to set the timezone before executing the query. This allows me to control the timezone based on the logged in user's preferences.
async function execWithTZ(sql, params, timezone) {
const client = await this.pool.connect();
await client.query<any>(`SET TIMEZONE TO '${timezone}'`, []);
return client.query<any>(sql, params);
}
const result = await execWithTZ('SELECT ...', [], 'Australia/Sydney');
QUESTION
I am trying to get Postgresql to return the day of the week of a specific date in a view. I later use this to display values by day.
The data is in a table with a column named updated which is a timestamptz field.
When running the following query using DBeaver SQL client against a PostgreSQL 12 database I get the values as I expect, with records updated on Thursday local time (just after midnight) showing up as Thursday
SELECT
count(v.id) AS count,
btrim(to_char(v.updated, 'DAY'::text)) AS day,
date_trunc('DAY'::text, v.updated) AS "updatedDay"
FROM table v
GROUP BY (to_char(v.updated, 'DAY'::text)), (date_trunc('DAY'::text, v.updated))
I put this in a view and when I query this view using node-postgres the counts are for the previous day (Wednesday), which I presume is because the database thinks it should interpret the dates in the UTC timezone.
To further prove the point, when I change the above query to use DAYTZ instead of just DAY in DBeaver I get THURSDAYAEST but in nodejs as result I get WEDNESDAYUTC
Changing all my dates to be without timezone and forcing everything to UTC on the way in is not an option for me.
How can I make node-postgres tell the database what timezone I want these dates interpreted as so that I can get the correct day?
UPDATE 1
I managed to get PostgreSQL to return the correct values to postgres node by setting the database user's timezone.
ALTER ROLE visuo_ingest SET TIMEZONE TO 'Australia/Sydney';
Now the counts for things that happened on Thursday Sydney time is counted for Thursday and not Wednesday.
Still interested in a way to do this on the connection rather than the database user level.

Answer 1

Still interested in a way to do this on the connection rather than the database user level.
You already found the right setting, there's no reason to alter it on a role only. You can also change the setting in a client session by running the SET command
SET TIMEZONE TO 'Australia/Sydney';
Just put that in a pgClient.query("…"); right after connecting the client.