I load an ods file. In the sheet, I've a time field, like 14:23:12. php-excel-reader found 15:23:12 for the field (1 hour increased). It's ok for the same file save in format xlsx. Tanks, Eric.

I also tested the plugin with a highly complex ODS file. In Excel, users load ODS files by clicking a special button in a toolbar rather than using the regular Open operation from the File menu.