#include <RTClib.h>
RTC_DS1307 rtc;

const char * daysOfTheWeek[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

const byte targetHour   = 12;
const byte targetMinute = 50;
const byte targetSecond =  0;

void printTime(DateTime & now, bool nl = false) {
  Serial.print(now.hour());
  Serial.print(':');
  Serial.print(now.minute());
  Serial.print(':');
  Serial.print(now.second());
  if (nl) Serial.println();
}

void setup() {

  Serial.begin(115200);

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

  rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));

  Serial.println("Ready");
}

void loop() {
  DateTime now = rtc.now();
  DateTime targetTime(now.year(), now.month(), now.day(), targetHour, targetMinute, targetSecond);

  Serial.print("Now = "); printTime(now);
  Serial.print(" versus target = "); printTime(targetTime, true);

  if (now == targetTime) {
    Serial.println("Bingo"); // YOU WILL GET MULTIPLE HITS AS LONG AS YOU ARE WITHIN THE TARGET SECOND
  }

  delay(100);
}