period compare array of date overlap
checkDateTimeOverlap = (dateTimes)=>{
let isOverlap = false;
dateTimes.forEach((time,i) => {
let st1 = time[0];
let et1 = time[1];
dateTimes.forEach((time2,j) => {
if(i != j){
let st2 = time2[0];
let et2 = time2[1];
if (st1 >= st2 && st1 <= et2 || et1 >= st2 && et1 <= et2 || st2 >= st1 && st2 <= et1 || et2 >= st1 && et2 <= et1) {
isOverlap = true;
}else{
isOverlap = false;
}
}
})
});
return isOverlap;
}