I found a nice example (see full size image) on this site. It's for managing sports venue availability in a sports tournament but the design could easily be applied to opening hours for a restaurant. You wouldn't need the last two columns.

What I like:

• Easy to drag sliders and clear visual availability across a week
• Shows the specific start and end times next to each day
• Shows the total time the restaurant would be open each day
• Granular control by clicking on a slider handle then using the arrow keys on the keyboard which moves the slider handle along by 5 minutes at a time
• Big button to clear the schedule and start again in one click
• Can be easily accomplished with jQueryUI slider.

Cons:

• Doesn't allow for split opening hours over a weekday. You would probably need to dynamically add another row if they wanted split opening hours for that weekday.

I found a nice example (see full size image) on this site. It's for managing sports venue availability in a sports tournament but the design could easily be applied to opening hours for a restaurant. You wouldn't need the last two columns.

What I like:

• Easy to drag sliders and clear visual availability across a week
• Faster and easier to set time ranges than multiple drop down lists with time information
• Shows the specific start and end times next to each day
• Shows the total time the restaurant would be open each day
• Granular control by clicking on a slider handle then using the arrow keys on the keyboard which moves the slider handle along by 5 minutes at a time
• Big button to clear the schedule and start again in one click
• Can be easily accomplished with jQueryUI slider.

Cons:

• Doesn't allow for split opening hours over a weekday. You would probably need to dynamically add another row if they wanted split opening hours for that weekday.