I am in London, England, and I am thinking of ringing up a friend who now lives in Perth (Australia); can anybody tell me how the time difference works as I need to work out at what time I need to ring her (I don't want to wake her up in the middle of the night). Many thanks.
The time in Perth, Australia, is GMT + 8 hours. We in the UK are at GMT + ! hour (British Summer Time). Perth is 7 hours ahead of us. I am typing this at 10.45 p.m. on Thursday UK time, which is 5.45 a.m. on Friday in Perth.
Look at the clock and work out what time it will be in 7 hours' time. That is the time now in Perth. OK?