A check for BBC One
Compare the national or regional schedule with the edition the player names. If the two guides agree except around a local news slot, verify the station edition rather than applying a time offset to the entire guide.
Check the station edition
Record one programme and its scheduled local time on the broadcaster page. Compare it with the channel label and time displayed in your player.
Check the guide if the live feed works
If the programme matches the live edition but the guide is wrong, confirm the channel mapping before changing the device clock.