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Sum up time in one column of excel hh:mm:ss.mss (mss is mili second in three figures)

Hi i have a time column in hh:mm:ss.mss format

which i want summed up and displayed as a table in html
also the table is

Date Time
2/03/1994 00:01:31:109
2/03/1994 00:01:31:109
3/03/1994 00:02:31:109
3/03/1994 00:02:31:109

If any can help with syntax how to display table 2/03/1994 - sum of both time 3/03/1994 - sum of both time

let table = document.querySelector(".table");
(
  async() => {
    let workbook = XLSX.read(await (await fetch("./Book.xlsx")).arrayBuffer());
    console.log(workbook);
    let worksheet = workbook.SheetNames;
    worksheet.forEach(name => {
      let html = XLSX.utils.sheet_to_html(workbook.Sheets[name]);
      table.innerHTML += `
                            <h3>${name}</h3>${html}
                            `;
    })
  }
)()
<table class="table">
</table>

about 4 years ago · Santiago Trujillo
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