Discord.py Bot run function at specific time every day

The heroku free plan is Linux. Therefore cron will let you run things at a specific time and /etc/init.d/ will let you run things at start up. It’s a good thing to know your OS.

You can write a function to run periodically on a different thread and check if it's the right time to send your message like this example:

from datetime import datetimeimport threadingdef checkTime():    # This function runs periodically every 1 second    threading.Timer(1, checkTime).start()    now = datetime.now()    current_time = now.strftime("%H:%M:%S")    print("Current Time =", current_time)    if(current_time == '02:11:00'):  # check if matches with the desired time        print('sending message')checkTime()

I know I am late, but this may be helpful for future users.
There is a library called APScheduler which can be used to run functions by setting a cron job (there are other ways too instead of cron. Read more).

A small example will be like:

import discordfrom discord.ext import commandsfrom apscheduler.schedulers.asyncio import AsyncIOSchedulerfrom apscheduler.triggers.cron import CronTriggerclass Scheduler(commands.Cog):    """Schedule commands."""    def __init__(self, bot):        self.bot = bot        # Initialize session        self.session = aiohttp.ClientSession()        # Scheduled events    async def schedule_func(self):    def schedule(self):        # Initialize scheduler        schedule_log = logging.getLogger("apscheduler")        schedule_log.setLevel(logging.WARNING)        job_defaults = {            "coalesce": True,            "max_instances": 5,            "misfire_grace_time": 15,            "replace_existing": True,        }        scheduler = AsyncIOScheduler(job_defaults = job_defaults,                           logger = schedule_log)        # Add jobs to scheduler        scheduler.add_job(self.schedule_func, CronTrigger.from_crontab("0 * * * *"))         # Every hour

And in our main.py file add this (after importing the schedule_jobs.py file obviously):

# Start scheduled commandsscheduler = schedule_jobs.Scheduler(bot).schedule()scheduler.start()