My Z3801A happily accepted a recent year (2016?) when it rolled over. You have to do the power-down, disconnect antenna, send corrected date, power down, connect antenna, power up sequence. I don't think the updated date appears until the unit starts tracking satellites again. Or, Lady Heather will detect rolled over date errors and correct them. The latest Lady Heather v6 version can echo all the receiver data as NMEA strings to another serial port or TCP/IP connection with the (date/time corrected. -------------------- > The first problem is that the Z3801 doesn't accept dates after 2007.