Timer nodes emit messages according to a schedule. The schedule can be set as a simple interval in minutes, hours, or days, or using a Cron expression.

Message Formats


Events are sent to Function nodes connected to the output of Timer nodes. Here is an overview of commonly used event properties:

Property Type Description
time string Timestamp, in ISO 8601 format. Example: 2008-09-22T14:01:54.957Z

See https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/EventTypes.html#schedule_event_type for further details on the output message format.



A label used for the node in the canvas.


The type of the schedule, either as a simple interval or a Cron specification


The count and unit of the scheduled interval.


The Cron expression specifying when events are emitted. The expression must contain the sixth “Year” field.


When specifying a schedule using a Cron expression, the Day-Of-Month and Day-Of-Week fields may not both be specified. If one of these fields is specified, the other field must be set to ?.

Events are emitted at most once per minute, even if the Cron expression specifies a more frequent interval.

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