London, England is in the GMT/UTC timezone. Washington DC is inthe EST(UTC-5) timezone. London is five hours ahead of WashingtonDC.Washington DC begins daylight savings on the second Sunday ofMarch, whereas London does not start until the last Sunday inMarch. London finishes daylight savings on the last Sunday ofOctober and Washington DC on the first Sunday of November. Duringthese weeks, the time difference is four hours.