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You can write your own sort function. Then call sort on your array

Using ES6 style

const compare = (a,b) => {
  if (a.uploadedAt < b.uploadedAt)
    return -1;
  else if (a.uploadedAt > b.uploadedAt)
    return 1;
  else 
    return 0;
}

You need to merge your arrays into one array.

const data = firstArrayFromPromise.concat(secondArrayFromPromise)

Our array may looks like this

const data = [
    {
        uploadedAt: new Date(2016,0,1),
        data : 'object1'
    },
    {
        uploadedAt: new Date(2015,0,1),
        data : 'object2'
    },
     {
        uploadedAt: new Date(2016,0,1),
        data : 'object3'
    },
]

Show if it's working

console.log(data.sort(compare))