Reminder Workflow does not recalculate new date to send email, if due date is changed

Question

I created a basic reminder workflow using due date, and status column. it works well.
Let's say, I want to send a reminder email 2 days prior to the due date.
I used Add -2 to due date and set a variable
then used Pause variable
if status is not equal to completed
then send email
And I have this set to initiate when a new item is created, and modified.
However, if the due date is changed, it does not recalculate the new date to send the reminder email.  Help!

Answer 1

Hi MonalisaM,
The in-progress workflow instance will be unable to re-start itself when list item is modified, but I think you can design workflow with using the second workflow to update the list item one filed, then this update triggers
the first workflow again.
Stop this reminder workflow (first workflow) when due date is changed, then this will trigger the second workflow to change another custom column(e.g. Flag), then the first workflow will be triggered due to this custom column
Flag value changed by second workflow, I mean the second workflow is used to upadate this custom list item one filed(e.g. Flag) in order to trigger the reminder workflow(first workflow).
You can read the following article for more information to understand how to make the first workflow re-start by using second workflow.
http://sharepoint713.blogspot.com/2011/09/sharepoint-designer-workflow-to-send.html
Thanks
Daniel Yang
TechNet Community Support