ClockWise is a suitable application which includes a scheduler, a time client and a calendar and allows you to schedule various events.

You can automate everything! You can schedule up to 200 external or built-in events! Run or close any program whenever you want.

Built-in options include system reboot, shutdown, automatically setting the system time to the atomic clock at NIST or any Internet NTP server, connection or disconnection from the Internet and Active Desktop refresh. On-line timer log includes daily, weekly and monthly stats.