I am enjoying a well deserved holiday in Rio de Janeiro and received one of the standard emails from BA that my flight time had been changes.

Departure was originally at 23.55 and as changed to 0.05 - not a big deal with a 10 minute change one would think. However BA decided to keep the date unchanged, so rather than delaying my flight by 10 minutes it was moved forward by 23 hours and 50 minutes.

Called up BA and got the flight changed, so no issue really. But a lesson learned - do not ignore those time change emails.