[рони]

darktowerk56c,

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let data = json.reduce((obj, el)=>{
let date = el.date.split(" ")[0];
if(obj[date]) obj[date].push(el);
else {
    let docs = [el], ob = {date, docs},
    id = obj.data.push(ob);
    ob.id = id;
    obj[date] = docs;
}
return obj
}, {data : []}).data;
console.log(data)