By using Maatwebsite/Laravel-Excel version 3.1 to import excel sheet, here I faced an issue date time column of the excel sheet returns unknown number. How to solve this? Example : Consider Cell value "29/07/1989" and returns as "32178" when import.
The numbers come from excel itself, dates stored in excel as numeric values. http://www.cpearson.com/excel/datetime.htm
For Laravel framework 5.6 and maatwebsite/excel package version 3.1, to convert date from excel numbers to normal date format, this function
PhpOffice\PhpSpreadsheet\Shared\Date::excelToDateTimeObject($dateFromExcel)
can be used. It accepts integer(excel date) and returns DateTime object.More information can be found here https://github.com/Maatwebsite/Laravel-Excel/issues/1832
From this answer: https://stackoverflow.com/a/55139981/9133724