How to run Celery Periodic task at every end of the month

Question

Basically, I have a task to generate Invoice. So I have created a function generate_invoice() in my tasks.py file.

Now, I am using @periodic_task to call the function. But I need my task to run only on the last date of the month around 11:55 pm - 11:57 pm.

I am getting the last date of month using this function:

def get_last_date():
        today = timezone.now()
        year = today.year
        month = today.month
        last_date = calendar.monthrange(year, month)[1]
        return str(last_date)

My code for task looks like this:

@periodic_task(run_every=(crontab(day_of_month=get_last_date())), name="invoice_simulation", ignore_result=True)
def invoice_simulation():
    generate_invoice()

But this is not working!

Or is there any better way to implement this feature then please suggest.

How i did this task: Get the first day of the next month (12:01am), convert to dt obj and subtract 5 minutes. I don't think there is an easy "run every" as that is relative to the month. If you "run at" this can work. My exp is not in celery as I have generally written my own wrappers and cron tasks from scratch, so this solution may not convert cleanly. We had the exact same problem in a start-up and this approach worked great. — Marc, Dec 06 '17 at 19:21

score 2 · Accepted Answer · answered Dec 06 '17 at 19:37

2

A rather simpler solution would be to run the schedule every day at 11:55 PM, and check inside the task if today is the last day of the month. If so, generate the invoice. If not then simply do nothing.

Something like:

@periodic_task(run_every=(crontab(hour=23, minute=55)), name="invoice_simulation", ignore_result=True)
def invoice_simulation():
    if timezone.now().day == get_last_date():
        generate_invoice()

Just make sure that timezone and crontab do not conflict each other. Both must either be TZ aware (or in UTC), or use naive times for both.

answered Dec 06 '17 at 19:37

oxalorg

2,768
1
16
27

for testing, I have given ```crontab(hour=1, minute=22)``` so, that it runs now and I can see but it is not executed at this time. – Shubham Srivastava Dec 06 '17 at 19:55
@ShubhamSrivastava You're welcome. Could you mark it as an answer if it solves your question? Thanks ^_^ – oxalorg Dec 07 '17 at 15:48

score -1 · Answer 2 · answered Dec 06 '17 at 19:23

-1

Update your get_last_date() function as follows.

def get_last_date():
    today = datetime.date.today()
    year = today.year
    month = today.month
    last_date = calendar.monthrange(year, month)
    return str(last_date)

answered Dec 06 '17 at 19:23

Atul Rokade

156
1
4

throwing error: ```ValueError: Invalid weekday literal '(4'``` when this value returns to ```@periodic_tasks``` – Shubham Srivastava Dec 06 '17 at 19:27

How to run Celery Periodic task at every end of the month

2 Answers2