Using seconds with rtc for less than a minute timer

Projects Programming
7

I am using an Uno as stated above

So this is what I have so far but I am unsure for how to layout the sum as currently this does not work

15:01 on
15:01:45 off

pumpState = (now.hour()*3600 + now.minute()*60) + now.second();

if (pumpState >= 54060 && pumpState < 54105){
digitalWrite (pumpPin, LOW);
Serial.println("Water Pump ON");
}
else {
digitalWrite (pumpPin, HIGH);
Serial.println("Water Pump OFF");
}