I'm used to just thinking about GMT. I know that the UK is around GMT 0, the US is negative, and Japan is positive, so those are my starting points for other lo

I'm used to just thinking about GMT. I know that the UK is around GMT 0, the US is negative, and Japan is positive, so those are my starting points for other locations. I believe it has helped me that I have lived in different time zones, so it has become second-nature.