You could also just add the time until done to your local time.....
UK is the GMT follows the GMT time. Convert your time to 24h time (makes it easier) and add or lower to convert to GMT time. (or vice versa)
Local time: 07:51
Time difference: - 09:00
GMT time: 22:51.
(7-2 = -2, 24 - 2 = 22)
Now you'll be able to calculate time all throughout the world!