How to combine two array options in one field select dropdown

I want to combine two array object options in one field use select in reactJS. And this is my code:

const DayOptions = [
{
  value: 'day1',
  label: 'Day 1'
},
{
  value: 'day 2',
  label: 'Day 2'
},
 
etc...
];
 
const TimeOptions = [
{
  value: '10:00AM',
  label: '10:00 AM'
},
{
  value: '10:30AM',
  label: '10:30 AM'
},
 
etc...
  ];
 
 
 const getDataList = () => {
    const dataArr = []
    DayOptions.map((item, index) => {
      const newData = {
        value: item.value,
        label: item.label
      }
      dataArr.push(newData)
    });
    TimeOptions.map((item, index) => {
      const newData = {
        value: item.value,
        label: item.label
      }
      dataArr.push(newData)
    });
    return dataArr;
  };
 
return (
 <Select
  closeMenuOnSelect={true}
  options={getDataList()}
 />
)

But, this code only works to select one array (only day or time) and does not combine two arrays (day and time) like the image below that I want. So what should i do? Thanks.