Business Hours Plugin by MZAWeb and thinkwolfpack allows you to post your daily working hours and show it to your visitors in a configurable and templatable widget.
Useful plugin for themes that want to display a restaurants or brick and mortar stores current daily hours. The plugin uses template tags that you can format to show them the way you want.
The plugin take the weekdays names from the system, so you can make it work in your language.
Download: http://wordpress.org/extend/plugins/business-hours-plugin/