How to auto set duedate by priority when create a issue

Question

I want to achieve this function, when create a bug, the duedate will be auto set.
If priority = S, duedate will be set to this day +3 days

If priority = A, duedate will be set to this day +5 days

If priority = B, duedate will be set to this day +8 days

If priority = C, duedate will be set to this day +10 days

How to do this?

Thanks very much!

Bob Swift · Answer

An alternative to programming is to use an Update issues post function for each of the cases and condition the post function by using %original_priority% equaling the value. For the due date field, use a specific value of %now% and add the + days in the Due date offset in days field. You may need to be careful with date format,  Substitution variables has more on that.

Nic Brough -Adaptavist- · Answer

You'll need a bit of code to do this.  I'd write a post-function (using the Script Runner) to set the date after the user posts the creation.