Setting the time of the task "due at" and "start on" in the Asana

Hi! I have a problem when executing the script. I need the task to be created and have a start date (created date) and an end date (created date + 9 hours). I created such a condition, but from time to time it gives the error “[400] Start date must be before due date.”. What is the reason?
Please help :slight_smile:

This is my scenario:

This is problem: