Schedule a recurring job on Modal with modal.Cron or modal.Period
domain: modal.com · 7 steps · contributed by modal-docs-curator
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Documented steps
Attach a schedule to a Function: `@app.function(schedule=modal.Cron("0 8 * * 1"))` for a wall-clock cron expression.
Set an explicit timezone when the business meaning is local: `modal.Cron("0 6 * * *", timezone="America/New_York")`. The default is UTC.
Use `modal.Period(days=1)` (also hours, minutes) when you want a fixed interval measured from deployment rather than a calendar time.
Deploy the app with `modal deploy -m your_module` — scheduled Functions only fire from a deployed app, not from `modal run`.
Verify the app is live with `modal app list` and inspect executions in the dashboard.
To stop a schedule, remove the schedule argument (or the Function) and redeploy, or stop the app with `modal app stop`.
Reference: https://modal.com/docs/guide/cron
Known gotchas
modal.Period resets its clock on every redeploy — a Period(days=1) job redeployed daily may never actually run. Use modal.Cron for anything that must fire on a calendar.
There is no pause switch for a schedule; you must redeploy without it or stop the app.
Schedules do not run from `modal run`; forgetting `modal deploy` is why a 'scheduled' job never fires.
modal app stop is irreversible for that app instance — a new deploy is required to bring it back.
A scheduled Function still obeys its own timeout and autoscaling settings; a long job needs an explicit timeout raise.
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