Set start timer for process model, and stop process from running if start time is in business hours (9-6 Monday to Friday)

Hi everyone, 

I want to set a start timer for my process model, in which start date time will be provided in advance, and if the given start date time is within work hour (9-6pm Monday to Friday), the process model will send an error message stating it can not proceed during business hours, and the process model will not be run. 

I haven't had much experience working with process model, so really appreciated if anyone can give me some guidance :) 

Thanks a lot!

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