重命名分组数组中的键，以表示它们分组的日期

const data = [
  { timestamp: '2023-04-01T12:34:56Z', value: 10 },
  { timestamp: '2023-04-01T13:45:12Z', value: 20 },
  { timestamp: '2023-04-02T09:10:20Z', value: 30 }
];

const renameKeysByDate = (data) => {
  return data.map(item => {
    const date = new Date(item.timestamp).toISOString().split('T')[0];
    return { [date]: item.value };
  });
};

const result = renameKeysByDate(data);
console.log(result);

[
  { '2023-04-01': 10 },
  { '2023-04-01': 20 },
  { '2023-04-02': 30 }
]