Daylight Saving Timeĭaylight saving time consists in advancing the clocks one hour during the summer months so that more daylight is available during the evening.
#Utc time zone name full#
It should be noted that this rule is not always applied and each country establishes its deviation from UTC in full freedom.
This is because the Earth rotates from west to east and, therefore, countries east of the meridian receive sunlight before western countries. Similarly, 15 degrees longitude west of the Greenwich meridian equals -1 hour with respect to coordinated universal time (UTC-1).
15 degrees longitude east of the Greenwich meridian equals approximately +1 hour with respect to coordinated universal time (UTC+1). Generally, those countries west of the Greenwich meridian establish their official time by substracting minutes to UTC, whereas those countries east of the Greenwich meridian set their official time by adding minutes from UTC. Similarly, section 260 of title 15 of the United States Code of Law establishes the following time zones: UTC-2, two hours less than UTC) and are usually assigned a name.įor example, according to Mexico's national metrology center and the law governing the time system, in Mexico the following time zones have been established: These UTC deviations, either positive or negative, are called time zones, and they are expressed in terms of hours (i.e. In other words, the local time of a country is a deviation from UTC. To establish their official time, countries add or subtract minutes to UTC by taking into account political and economic reasons as well as their geographical position with respect to the Greenwich meridian. UTC is obtained from International Atomic Time, a time standard calculated from a weighted average of the signals of about 70 atomic clocks located in different parts of the world. Universal Time Coordinated, abbreviated as UTC, is the base time for all civilian clocks in the modern world.
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