rascunho sobreposicao

var hoursOk = {"slotTimes": [
    {"hourIni": "10:00", "hourEnd": "11:00"},
    {"hourIni":"13:00", "hourEnd": "15:00"},
    {"hourIni":"17:00", "hourEnd": "22:00"}
]};

var hoursErrado = {"slotTimes": [
    {"hourIni": "10:00", "hourEnd": "11:00"},
    {"hourIni":"13:00", "hourEnd": "15:00"},
    {"hourIni":"13:30", "hourEnd": "22:00"}
]};

var convertHourToMinutes = function(hrs) {
	var parts = hrs.split(":");
	return parseInt(parts[0], 10) * 60 + parseInt(parts[1], 10);
}

var convertHoursArrayToMinutesArray = function(arr){
  for(var i = 0; i < arr.slotTimes.length; i++){
  	arr.slotTimes[i].hourIni = convertHourToMinutes(arr.slotTimes[i].hourIni);
    arr.slotTimes[i].hourEnd = convertHourToMinutes(arr.slotTimes[i].hourEnd);
   
  }
}

var intersect = function(x1,x2,y1,y2){
    return x1 < y2 && y1 < x2;
}

var checkIntersect = function(arr){
//console.log(arr);
	for(var i = 0; i < arr.length; i++){
  	for(var j = 0; j < arr.length; j++){
    	if(j === i) {
      	continue;
      }
    		console.log(arr[i]);
        console.log(arr[j]);
    		if( intersect(arr[i].hourIni, arr[i].hourEnd, arr[j].hourIni, arr[j].hourEnd)){
        return true;
        }
    }
  }
  return false;
}

convertHoursArrayToMinutesArray(hoursOk);
console.log(checkIntersect(hoursOk.slotTimes) ? "tem sobreposicao" : "nao tem");