Unable to set Cron hash for day of week

1

Hi,

The UI displays the correct schedule when using the hash for day-of-week.

Screenshot 2024-11-05 at 09.00.19
Screenshot 2024-11-05 at 09.00.19714×137 4.81 KB

However, I cannot save the schedule, and pushing via blueprint causes the blueprint to fail.

Failed to parse int from 3#1: strconv.Atoi: parsing "3#1": invalid syntax

2

There are a lot of “bespoke” additions in Cron implementations that we don’t support. The rule of thumb are, given the reference that Cron configurations link to ( cron - Wikipedia ), if anything works “only in some implementations”, it probably doesn’t work on Render.

There are two alternatives here:

  • Don’t rely on Cron, set up a worker (or leverage a worker service you already have, Celery, Sidekiq, etc.) and some other system to enqueue the job to run on that first Wednesday of the month for the worker to process.
  • Add logic into the process being run to check for “first Wednesday of the month”. Exit if it isn’t, continue if it is, leaving the cron expression as 0 8 * * 3.