Hello, Is it possible to implement something like DateClock in Prefect 2? I was trying to implement custom Schedule, but getting validation error:

pydantic.error_wrappers.ValidationError: 9 validation errors for Deployment
schedule -> interval
  field required (type=value_error.missing)
schedule -> calendar_id
  extra fields not permitted (type=value_error.extra)
schedule -> run_times
  extra fields not permitted (type=value_error.extra)
schedule -> cron
  field required (type=value_error.missing)
schedule -> calendar_id
  extra fields not permitted (type=value_error.extra)
schedule -> run_times
  extra fields not permitted (type=value_error.extra)
schedule -> rrule
  field required (type=value_error.missing)
schedule -> calendar_id
  extra fields not permitted (type=value_error.extra)
schedule -> run_times
  extra fields not permitted (type=value_error.extra)

Hi Vadym, there are a couple supported mechanisms: •

Cron

is most appropriate for users who are already familiar with

cron

from previous use. •

Interval

is best suited for deployments that need to run at some consistent cadence that isn’t related to absolute time. •

RRule

is best suited for deployments that rely on calendar logic for simple recurring schedules, irregular intervals, exclusions, or day-of-month adjustments. Do these not cover the scenario you are trying to achieve?

Hi @Christopher Boyd. We have custom custom calendar data that we use in Prefect V1 to pass set of datetimes. Didn't find something similar.

Using rrule you should be able to pass specific dates

Tried

RDATE:20220920T200000Z,20220921T133000Z

but doesn't work, do not see scheduled flow runs

can you open a GitHub issue? could be some sort of bug or version issue