The official time difference is that Bulgaria is 2 hours ahead of GMT at this time of year. However, with Bulgarian time, that is probably 15:00 hours on Thursday 29th November. They have their own pace and do not like to be rushed. Most brits use the official tourist timings whilst in Bulgaria which is beer o'clock.
infact, if I were in Bulgaria now, it would be beer oclock. I wake up at beer o'clock, I eat at beer o'clock, but always stop snowboarding at beer o'clock.