MacMost Now 630: Creating Alarms, Reminders and Timers with Siri
On the iPhone 4S you can use Siri for a variety of time-based functions. You can create simple alarms in your Clock app with Siri and even change alarms. You can also start, pause and stop timers. You can also create more complex reminders that then sync across your devices with iCloud. Reminders can be location-based as well as time-based.