var myArr = JSON.parse('[{"id":"1","date":"2017-12-01","time":"00:00:00","active":"1"},{"id":"2","date":"2017-12-02","time":"00:00:00","active":"1"},{"id":"3","date":"2017-12-08","time":"00:00:00","active":"1"},{"id":"4","date":"2017-12-09","time":"00:00:00","active":"1"},{"id":"5","date":"2017-12-15","time":"00:00:00","active":"1"},{"id":"6","date":"2017-12-16","time":"00:00:00","active":"1"},{"id":"7","date":"2017-12-22","time":"20:00:00","active":"1"}]');

​

var gew_datum="2017-12-22";

/*

function getObjects(obj, key, val) {

    var objects = [];

    for (var i in obj) {

        if (!obj.hasOwnProperty(i)) continue;

        if (typeof obj[i] == 'object') {

            objects = objects.concat(getObjects(obj[i], key, val));

        } else if (i == key && obj[key] == val) {

            objects.push(obj);

        }

    }

    return objects;

}

​

result = getObjects(myArr, 'date', gew_datum);

​

if (result.length == 0) {console.log("nicht gefunden");}

else {console.log("gefunden");}

​

console.log(result);

​

var arr = Object.keys(result).map(function(key){

  return { key: key, value: result[key] };

});

​

console.log(myArr[0]['time']);*/

var time_gef="";

var gefunden =0;

for(var i = 0;i < myArr.length;i++) {

  if(gew_datum == myArr[i]['date']){

  gefunden=1; time_gef=myArr[i]['time'];

  }

}

​

console.log(time_gef);

console.log(gefunden);

​