Date format is not changing

[saikmadana]

When I try to change the format of the date it is not changing

const DATE = {
  numberFormat: 'mm/dd/yyyy'
}
const xlSheet = new xl.Workbook({
  dateFormat: 'mm/dd/yyyy'
})
const DATE_STYLE = xlSheet.createStyle(DATE)
xlTab.cell(1, 1)  
  .date(each[key.key])
  .style(DATE_STYLE)

Still, the date is appearing like 11-12-2020

Can you please help what are the other changes I need to make.

Thank you...

[nivb52]

try like this -
DATE_STYLE = { numberFormat: 'dd / mm / yyyy' }
.style(DATE_STYLE );