I have a php script that have to parse an excel file with some date and time to import in my mysql database
Screen of the xlsx file :

I'm using the PHPExcel library to read the file
- When I get the cell value with getValue() method, it returns the formula =J4+"01:00:00" as showed in the excel formula field. Ok normal
- When I use the the getCalculatedValue() method, it returns "#VALUE!". As excell / Libreoffice don't have any problem to calculate the formulas, I have no idea why the PHPExcel library is not able to calculate this quite simple formulas.
Do anyone had the same issue and know a trick to fix this issue ? Or do I realy have to tell users not use any formulas fort date fields type ?