set dballe station data context for date and time (in object, not dballe session)
Definizione alla linea 2008 del file dballe_class.F03.
2009 this%datetime%datetime == that%datetime%datetime .and. &
2010 this%network%vol7d_network == that%network%vol7d_network .and. &
2011 this%ana%vol7d_ana == that%ana%vol7d_ana &