If you already know the time, use the Event Time Announcer to find local times around the globe instead. The Time Zone Converter provides you with the corresponding local time in one location of your choice.
Please note that if one of the participants are in the United Kingdom, you should select a city there (e.g. London), instead of UTC / GMT. London/UK is one hour ahead of GMT during daylight saving time (DST) and this service will adjust for DST automatically.