I'm building a timeclock buzzer application. At certain times during the day buzzer.wav plays. So I need to figure out how to fire off these events. The times I want buzzer.wav to play is something like...

05:59
06:00
11:29
11:30
14:29
14:30


I can use a timer and compare the system time but I need the timer interval to be less than 1 minute (as you can see above) and that could cause the buzzer to play multiple times within that time slot. Any ideas?