How to get the datetime of NYSE close time (4.00 PM EST) in UTC

I have a background task that I want to schedule to run once the NYSE is closed.
My background scheduler (redis-rq) requires the time will be in UTC and I'm using python.
The task is scheduled during the trading day, so it means that I can't use offset or specific dates because it can be called dynamically.

So, what I just want is that once a trigger is called, I want to schedule the task to run at the end of the current trading day, which again is 16:00 EST time.

I've tried several options like getting the time in EST with:

datetime.time(16, 0, tzinfo=pytz.timezone('US/Eastern'))

But I can't figure out how to convert it to UTC, I tried stuff like .replace() with no success.

Thanks in advance.

You can use today's date, combine with the desired NY time, set the time zone to New York (US Eastern), then convert to UTC:

from datetime import date, datetime, time
from zoneinfo import ZoneInfo # Python 3.9

t_utc = (
    datetime.combine(
        date.today(),
        time(16,0),
    )
    .replace(tzinfo=ZoneInfo("America/New_York"))
    .astimezone(ZoneInfo("UTC"))
)

print(t_utc)
2023-05-10 20:00:00+00:00

Note on time zone handling:

• with the deprecated pytz you cannot replace the tzinfo, use e.g. pytz.timezone("America/New_York").localize(... instead
• for zoneinfo to work properly on Windows, make sure to have tzdata package installed and up-to-date

Try to use pytz library: https://pypi.org/project/pytz/ .

The code with this library can solve your task:

import pytz
from datetime import datetime, time

nyse_close_time_et = time(16, 0)
now_et = datetime.now(pytz.timezone('US/Eastern'))
nyse_close_datetime_et = datetime.combine(now_et.date(), nyse_close_time_et)
nyse_close_datetime_utc = nyse_close_datetime_et.astimezone(pytz.utc)
print(nyse_close_datetime_utc)