Pass through Date object to XLSX.utils.sheet_add_aoa so can be Date field in Excel
Pass through Date object to XLSX.utils.sheet_add_aoa so can be Date field in Excel

XLSX.utils.sheet_add_aoa handles Date objects and formats the field as a Date field in Excel.

However currently tabulator does JSON.stringify on the object therefore the actual Date object is never passed to XLSX.utils.sheet_add_aoa.

This pull request checks if the field is a Date object and therefore doesnt JSON.stringify, resulting in Excel opening the xlsx and the field being shown as a Date field.
olifolkerd/tabulator