Importing xlsx file shows different data format

[gab-logicbase]

I'm trying to upload the following xlsx file but when I debug the imported values it shows floating numbers

Import File example:

Output from dump:

[patrickbrouwers]

This is how Excel stores those kind of things behind the scenes, you have to convert it to format you want, like with
\PhpOffice\PhpSpreadsheet\Shared\Date::excelToDateTimeObject($excelDate) or \PhpOffice\PhpSpreadsheet\Shared\Date::excelToTimeStamp($excelDate)

[gab-logicbase]

Thanks for the input.. I'll take a note on this with regards to date and time data.