Hi any
I believe you are GMT+10 in Melbourne, so:
UK = GMT+0 (so we are 10 hours ahead)
USA West Coast = GMT-7 (so we are 17 hours ahead)
USA East Coast = GMT-4 (so we are 14 hours ahead)
There is always Daylight Saving to take into account. I find
www.time.gov is helpful for US times..