Automation for moving dates on a subtask by the same delta as the parent issue

[Swati Rastogi]

Looking for some suggestion on creation an automation or JQL to help move a subtask by the same number of days by which it's changed in the parent task.

For instance, due date on a Story is Aug 15, 2023, which gets changed to Aug 17, 2023. Then to move the due date on the Sub-task as well by two days irrespective of the due date, so for instance the due date on sub-task is Aug 12, 2023 that gets updated to Aug 14, 2023
Thanks for any suggestions and insights for this request.

[Trudy P Claspill · Accepted solution]

Hello @Swati Rastogi 

This is the rule you'll need.

The smart value in the Create Variable action is:

{{fieldChange.from.toDate.diff(fieldChange.to.toDate).days}}

The smart value in the Edit action is:

{{issue.duedate.plusDays(dueDateDiff.asNumber)}}

You may want to change the Condition where I'm checking that the trigger issue is a Story.

If it is possible that a subtask may have no due date, you may want to add a Condition in the For: Sub-tasks branch to first check if the subtask has a due date before editing it.

[Swati Rastogi]

That works perfect! Thank you so much Trudy for such a quick response! Saved the day!!