than 70 nations around the world use DST to take advantage of
longer summer hours by setting clocks ahead in spring and back
in the fall.
observance of daylight saving time (more commonly known in various
parts of the U.S. as "daylight savings time")
remains controversial. Soon
after it was enacted, American farmers actually had daylight
saving time repealed in favor of "God's time" and,
although the movement was short-lived, in many rural areas the
exceptions to DST occurred during World War II, and later during
the 1970's Arab Oil Embargo, when daylight saving time was rolled
back to help conserve energy consumption.
legislation took effect in 2007, allowing
Americans to enjoy more daylight beginning in March and ending
in November, adding extra days to the traditional April-October
daylight saving time span.
the observance serves a dual purpose in that it also marks the
time to change the batteries in household fire and smoke alarms
in many communities.
tradition, the sun-drenched states of Arizona and Hawaii are
the only places in the continental U.S. that still do not observe
daylight saving time, but instead stay on "standard time"