Revert "Foramtted dates in new class making it minutes in spreadsheet report and keeping it hh:mm:ss in frontend datagrids."

This reverts commit a6a3bf9813ccec9b31e5917f86fe5916346a47ea.
Revert "Revert "Foramtted dates in new class making it minutes in spreadsheet report and keeping it hh:mm:ss in frontend datagrids.""

This reverts commit f832ec972ac80b93d2b9689bc7362d6d78a60d50.
Bugfix 226 (rewind with totals to gestione in spreadsheet report)