Culture File 31:
Daylight Savings Time
Many countries have Daylight Savings Time. This is called Summer Time in Europe (BST or British Summer Time in the U.K.).
In the winter, London is on GMT or Greenwich Mean Time. GMT times are used for international air travel, and all time differences are measured from GMT.
In the summer many countries ‘change the clocks’ so as to change the number of useful daylight hours.
So in Britain, BST is one hour ahead of GMT. The clocks change in March and October. In March 6 a.m. becomes 7 a.m. and we say the clocks ‘go forward.’ In October the clocks ‘go back.’ Children are often taught, «Spring forward. Fall back.»
In comparison, Japan does not use daylight saving time, so that in the summer daylight can begin at 4:30 a.m., and it gets dark at 7 p.m. New York (on the same line of latitude) uses daylight saving time, so that daylight begins later at 5:30 a.m. and it gets dark later at 8 p.m.