Time presentations
including a section on the world wide differences in defining and implementing Daylight Saving Time
(known in the United Kingdom as British Summer Time)
which may be summarised as:-
European Community:-
start and end dates of summer time as the last Sundays in March and October
USA
"Daylight Saving Time begins for most of the United States at 2 a.m. on the first Sunday of April.
Time reverts to standard time at 2 a.m. on the last Sunday of October