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If your clocks are on Daylight Saving Time (DST), a.k.a. Summer Time, on the weekend when Standard Time resumes, make the time one hour earlier. A popular mnemonic device for remembering which direction to adjust is "spring forward; fall back". On some older clocks you have to advance the time 11 hours.

For example, in North America, every time zone of every country that observes DST except Cuba begins and ends DST at 2:00 AM. That means that on the 1st Sunday of Nov., or on the last Sunday of Oct. in most of Mexico, one minute after 1:59 AM is 1:00 AM. On the east coast of the U.S., one minute after 1:59 AM EDT is 1:00 AM EST, on the U.S. west coast, one minute after 1:59 AM PDT is 1:00 AM PST, and so on. In Europe, every country that observes Summer Time does the time changes at the same time (1 AM UTC), no matter which time zone they're in. So on the last Sunday of Oct., when universal time changes from 00:59 to 01:00, most of Europe changes from 02:59 CEST to 02:00 CET, eastern Europe changes from 03:59 EEST to 03:00 EET, and Western Europe changes from 01:59 WEST, BST or IEST (Irish Summer Time) to 01:00 WET or GMT.

There is currently only one place in world where the time change for DST is not one hour. On Australia's Lord Howe Island clocks are adjusted forward one half hour at the beginning of DST (on the first Sunday of October) and turned back one half hour at the end of DST (on the first Sunday of April). Because the Southern Hemisphere's summer is in the opposite half of the year from the northern hemisphere's summer, the southern hemisphere observes DST during the opposite half of the year from the northern hemisphere.

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