[otrs] SLA times seem to ignore WorkingHours

I have a fresh install of OTRS 2.3.4. I have a ticket with an sla that has escalation times filled out for it, I have the working hours set and a calendar with the same settings set as the calendar for my queues, the problem i'm seeing is that even when outside of the working hours, the countdown to the times for escalation defined in the sla are still counting down. Any help or advise would be greatly appreciated Mike