Full calendar business hours

like so

businessHours:
    {

            start: '11:00',
            end:   '12:00',
            dow: [ 1, 2, 3, 4, 5]
    },

in order to use different hours for different shifts -> use background events

events:
[
    {
        id:    'available_hours',
        start: '2015-1-13T8:00:00',
        end:   '2015-1-13T19:00:00',
        rendering: 'background'
    },
    {
        id:    'work',
        start: '2015-1-13T10:00:00',
        end:   '2015-1-13T16:00:00',
        constraint: 'available_hours'
    }
]

For more information, see this link, http://fullcalendar.io/docs/event_ui/eventConstraint/

There's several different ways you can approach this, depending on how you use the calendar. Hopefully the flexibility of the constraints will help you get what you need done.

Pretty glad this feature finally showed up!