Hello,
I tried a couple of community posts on similar problems but the doubles that people had issues with usually were the dates just unformatted.
I can't share the workflow nor the data since it's confidential but it's an extraction coming from a company software.
In the excel it appears in a "valid" format DD/MM/YYYY, but Alteryx reads it as double with just 5 numbers.
Might be my fault but I also can't make the ToString formula work to then use the Parse DateTime to help me.
Select tool also only identifies as double / int number type data and doesn't give me the Date option which would fix it entirely.
Alteryx read

Original excel file .xlsx

Thanks for the help,
Marcos