New York is in the UTC-5 time zone and London is in the UTC time zone. New York is five hours behind London, so 0800 in New York is 1300 in London. Both New York and London observe daylight savings. New York moves into the UTC-4 time zone on the second Sunday of March until the first Sunday of November. London moves into the UTC+1 time zone on the last Sunday of March until the first Sunday of October. In the short period of time where one country is observing daylight savings and the other is not, there is only a four hour time difference between the two, so 0800 would be 1200.