Need to configure timer to execute on specific date and time in Start Event node of Process Model

RE: Need to configure timer to execute on specific date and time in Start Event node of Process Model

Shubham Aware — Mon, 21 Jul 2025 18:19:30 GMT

Timer expressions are evaluated at specific intervals, not dynamically during runtime. The solution is to configure a periodic timer that triggers at regular intervals, then immediately add an XOR Gateway with the condition now() >= rule!YourExpressionRule(). When the condition matches, proceed with your workflow; otherwise, terminate the instance at an End node. This creates a polling mechanism that monitors at each interval until your specified datetime arrives.

Remember to set the process model to Inactive after your target datetime to stop recurring.

RE: Need to configure timer to execute on specific date and time in Start Event node of Process Model

Stefan Helzle — Mon, 21 Jul 2025 18:06:40 GMT

Running an expression inside a start node timer will not work. It evaluates that expression only once an the time of publish or deployment.

If you have to use this expression, start the process in a 10 minutes interval, and evaluate the current time against the expression output in an XOR. Then, either continue the process, or go to an end node.

RE: Need to configure timer to execute on specific date and time in Start Event node of Process Model

Harsha Sharma — Mon, 21 Jul 2025 17:47:53 GMT

I have updated the answer above to adjust this. Have a look

RE: Need to configure timer to execute on specific date and time in Start Event node of Process Model

ayushimittal — Mon, 21 Jul 2025 17:47:17 GMT

Hi Harsha, Thanks for your response.

But now calculates seconds also. So output of

rule!ExpressionRuleName()=now() is never becoming true. If I apply rule!ExpressionRuleName()>=now() then it is becoming true but in that case it will become true next day onwards as well and I want to run this PM only once on that specific date and time.

RE: Need to configure timer to execute on specific date and time in Start Event node of Process Model

Harsha Sharma — Mon, 21 Jul 2025 17:37:39 GMT

As per other suggestions here, xor and a start node timer to run at intervals with a definitive end date seems to be the best way to achieve this! There was error in my earlier suggestion so try this way.