[Python] Enabling Daylight saving adjustment for Flask-APScheduler

I am trying to run APScheduler for my Flask app, but I can't get daylight saving time working for the cron time.

In my app.py, I have something like this:

from flask import Flask
import pytz
from .scheduled_jobs import ScheduledJobs

class SchedulerAppConfig:
SCHEDULER_TIMEZONE = timezone=pytz.timezone('Europe/London')

app = Flask(__name__)
app.config.from_object(SchedulerAppConfig())

ScheduledJobs.init(app)


Then in scheduled_jobs.py, I have this:

from flask_apscheduler import APScheduler

scheduler = APScheduler()
scheduler.init_app(app)
scheduler.start()

@scheduler.task('cron', id='test_job_1', hour='09', minute='15')
def test_job_1():
logger.info("Test job 1 executed")


I was expecting the task would be smart enough to have itself adjusted to the British summer time and start at 09:15, but the scheduler task seem to run at 10:15 rather than 09:15 (London time is UTC+1 in the summer and UTC+0 during winter).

What have I have missed?

Does the timezone in SchedulerAppConfig matter in my case? I don't see setting the timezone here does anything for me.

I am running the Flask app on a generic Ubuntu inside a Docker container. Do I need to set anything about the date/time settings on Ubuntu?

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