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


Emitted messages vary according to the underlying cloud infrastructure provider. For AWS, messages contain at least the following properties:

Field Type Description
time string ISO formatted date and time string. Example: 2015-12-22T18:43:48Z



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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