Gary Kovar

Assuming you have set the hours of your business with google places you can include them as a widget within your site. So, if you change your hours, change them with google and they will change on the widget as well.

Business-things

This adds a widget to your site that displays the hours of the business and whether it is currently open.

Adam Sommer

Why not be able to checkin on your blog so that your readers know where you are and have been? Sure there are other checkin sites on the Internet, but now you can count your blog as one of them.
WPCheckin allows location checkins to be displayed in a widget or on any page via shortcode. Using Google Places, choose a location closest to your geo location as determined by your browser’s HTML5 location information.
This plugin requires a Google API key to be able to retrieve locations nearby, and stores checkins in a custom post type.

WPCheckin Widget and Shortcode

Post checkins to your WordPress site, and using Google Places choose a location closest to your geo location.

Business-things vs WPCheckin Widget and Shortcode