Open / Close Times
You can set your opening and closed times and days and add these to your number so that when people call when your offices are closed they will be greeted in a different way.
You can configure and record a different out of hours message so that callers know that your offices are closed and you could give them instructions to perhaps call another number or let them know when the office will be back open.
When your offices are closed, you could for example configure your switchboard to go straight to answerphone and a missed call email alert will be sent to notify you. This ensures that you never miss an opportunity and gives you the option to call them back at a time more convenient to you!