Generally, in the summer when the dawn is early, adjusting the time for one hour artificially can make people get up early and go to bed early, reduce the amount of lighting, make full use of lighting resources, and thus save lighting electricity. Every country that adopts daylight saving time has different regulations.
2. Winter time usually refers to the standard time used locally in spoken English. In areas where daylight saving time is used, clocks are put forward one hour in summer and back to standard time in winter. Some people call the standard time "winter time". This is actually not rigorous.
In fact, the real "winter time" also exists. It is one hour slower than standard time (that is, two hours slower than daylight saving time). At present, only Ireland in the world uses this winter time. Czechoslovakia, Namibia and Chile have all used this time before.
The standard time is different areas in the same time zone, and the solar time or local average time set by the regional meridian is abandoned, and the synchronous time is adopted. This time calculation system is derived from universal time. Some countries and regions use daylight saving time, but it may not be mentioned in the standard time list.
Before 1883, the local average time was widely used in North America, which not only caused the disorder of local time, but also made the local and national train schedules very complicated. 1879 On February 8th, Sanford Fleming of Canada put forward the suggestion of standard time at the meeting of the Royal College of Canada, and the main railways headed by the intersection of Chicago adopted the standard time system. After the railway did this, many States adopted the new system almost immediately, but it took the US federal government almost 40 years to accept the system.
In 2007, the federal government of the United States promulgated a federal law, officially taking Coordinated Universal Time as the basis of standard time, and the United States Department of Economic Relations and Trade (the National Institute of Standards and Technology under its jurisdiction) and the United States Navy (the United States Naval Observatory under its jurisdiction) broadcast standard time (h. r. 2272:2007 2 1 century struggle).