RTC come on when time = now and stay on until time = now

hi guys,

im trying programme lights come on @ time , stay on unit next stated time elapses.

for example:

{ 
      datetime = rtc.now();
      if (
           (autolightson_h == now.hour()) &&
           (autolightson_m == now.minute()) &&
           (autolightson_s == now.second()))
           {
              //carry out x protocol until
           }
           {
           (autolightsoff_h == now.hour()) &&
           (autolightsoff_m == now.minute()) &&
           (autolightsoff_s == now.second()))
           }
}

i cant figure out how it,

would "do...while" function work?

cheers, guys

any one?

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