Deadline workflow

You may need to change DaysFrom() to DaysTo()

If I understood it correctly DaysFrom() is used to calculate days after the comparison date, and DaysTo() is used to calculate days before the comparison date.

And a side note, in larger vaults (100k+ objects) such controls in workflows might fail to finish in time. So, your workflow would miss the timeframe to automatically move to another state. 

Using a background task written in VAF would ensure the state transition will be done in time.

That problem can be reduced using Property Calculator, Background Operations to do the state transition rather than the build in automatic state transition in workflows. Property Calculator can be configured to only check the conditions once every night during low activity hours. This will relieve the automatic transition from checking all those objects every hour.