What RTC did you buy? Some have an alarm function, and some don't. I use an alarm to activate certain functions in my aquarium. The RTC only stores one alarm at a time. When the alarm triggers, it pulls a line high, which I use as an interrupt to the main processor. As each alarm is triggered, I store the next scheduled alarm in the RTC. That, I think, is the best way to schedule multiple events throughout a day. The RTC I use is the PCF8533.