<Form.Item label="日期范围" name="dateRange" rules={[{ required: true }]}>
  <DatePicker.RangePicker style={{ width: "100%" }} />
</Form.Item>

// onFinish 中拆分
const onFinish = (values: any) => {
  const [startDate, endDate] = values.dateRange || [];
  const payload = {
    ...values,
    start_date: startDate?.format('YYYY-MM-DD'),
    end_date: endDate?.format('YYYY-MM-DD'),
  };
  delete payload.dateRange;
  console.log(payload);
};

<Form.Item label="日期范围">
  <DatePicker.RangePicker
    style={{ width: "100%" }}
    onChange={(dates) => {
      form.setFieldsValue({
        start_date: dates?.[0]?.format('YYYY-MM-DD'),
        end_date: dates?.[1]?.format('YYYY-MM-DD'),
      });
    }}
  />
</Form.Item>

{/* 两个隐藏字段存真实值 */}
<Form.Item name="start_date" hidden><Input /></Form.Item>
<Form.Item name="end_date" hidden><Input /></Form.Item>

<Form.Item
  label="日期范围"
  name="dateRange"
  normalize={(value) => {
    if (!value) return undefined;
    return value.map((v: any) => v?.format('YYYY-MM-DD'));
  }}
  getValueProps={(value) => ({
    value: value ? value.map((v: string) => dayjs(v, 'YYYY-MM-DD')) : undefined
  })}
>
  <DatePicker.RangePicker style={{ width: "100%" }} />
</Form.Item>

// onFinish 中拿到的就是 ['2026-04-01', '2026-04-09']
// 再拆分：
const onFinish = (values: any) => {
  const [start_date, end_date] = values.dateRange || [];
  // ...
};