JavaScript - how to group items in array by date?

I highly recommend to read this article from which the solution below was taken.

For your data the solution would be:

// ONLINE-RUNNER:browser;

function groupItems(array, property) {
    return array.reduce(function(groups, item) {
        var name = item[property]
        var group = groups[name] || (groups[name] = []);
        group.push(item);
        return groups;
    }, { });
}


// Usage example:

var array = [
    {id: 1, date: '2022-11-03T22:00:00+00:00'},
    {id: 2, date: '2022-12-03T22:00:00+00:00'},
    {id: 3, date: '2022-11-03T22:00:00+00:00'},
    {id: 4, date: '2022-12-03T22:00:00+00:00'},
    {id: 5, date: '2022-12-03T22:00:00+00:00'}
];

var groups = groupItems(array, 'date'); // array will be grouped by 'date' property

for(var key in groups) {
    var group = groups[key];
    console.log('"' + key + '"\t' + JSON.stringify(group, null, 4))
}

See also

1. JavaScript - group / grouping array items with reduce method

References

1. Array.prototype.reduce() - JavaScript | MDN