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Is it possible to trigger a Prefect2 flow via the REST API with a later start time? This is possible via the UI for a custom run by specifying start time as later instead of now

you can. Taking a look at the <https://app.prefect.cloud/api/docs#tag/Deployments/operation/create_flow_run_from_deployment_api_accounts__account_id__workspaces__workspace_id__deployments__id__create_flow_run_post|Create Flow Run From Deployment> docs, under `state`-&gt;`state_details` there's a `scheduled_time` you can include

here's an example request payload generated from the UI that you can model your requests after
```{"name":"psi67-chactun","parameters":{"name":"hi"},"tags":["main"],"state":{"type":"SCHEDULED","message":"","state_details":{"scheduled_time":"2024-09-17T05:00:00.000Z","cache_expiration":null}},"empirical_policy":{"retries":null,"retry_delay":null,"pause_keys":[],"resuming":false},"work_queue_name":"dev","job_variables":{},"enforce_parameter_schema":false}```