Hello there,
I have nintex form with column Duedate (Datetime) where i manually fill Duedate.
I need nintex worflow, which send notifications to email one day before Duedate and one week after Duedate.
I dont know how to set variable to [Duedate -1] and [Duedate +7].
Thanks for response:)
Finally i do this:
At form with variable DueDate i start WF which calculating date Duedate-7 and DueDate+1, this variables i save to columns with same name.
After that i start SITE WF where Iam Query list Item (DueDate-7 and DueDate+1) from form. This Items i save to Items Collection, then i use For Each where target collection is Items Collection where i save query items and store result in WF variable (ThisDueItem-7,ThisDueDate+1).
This is very simple solution and its WORKS GOOD ! May be usefull for someone 
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