![]() ![]() The GMT time scale is no longer used, and the use of GMT to designate UTC is discouraged. With the following table you can calculate the local time in the main cities of the world.Ĭoordinated Universal Time (UTC) is often referred to as Greenwich Mean Time (GMT). Like Madrid, other jurisdictions in the world implement daylight saving time with their own rules. However, during the period between the last Sunday of March and the last Sunday of October, the Central European Summer Time (UTC+2) is used where the clocks are set one hour ahead. For example, Madrid, Spain uses Central European Time (UTC+1) most of the year. 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. 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. South Australia and the NSW town of Broken Hill move from ACST to Australian Central Daylight Time (ACDT), and clocks are advanced to UTC +10.5.ĭaylight saving is not observed in Queensland, the Northern Territory or Western Australia.įor more information about time zones and daylight saving in other Australian states and territories, visit time zones and daylight saving on the Australian Government website.Universal Time Coordinated, abbreviated as UTC, is the base time for all civilian clocks in the modern world. Lord Howe Island moves from LHST to Lord Howe Daylight Time (LHDT), and clocks are advanced to UTC +11. NSW (except Broken Hill and Lord Howe Island), the Australian Capital Territory, Victoria and Tasmania move from AEST to Australian Eastern Daylight Time (AEDT), and clocks are advanced to UTC +11. In periods of daylight saving an hour is added to the Local Standard Time (except for on Lord Howe Island where 30 minutes is added). Daylight saving or summer time is commonly expressed as AEDT (Australian Eastern Daylight Time). Simplifying, the UTC time divides time into days, hours, minutes and seconds, but while one day is always of 24 hours and one hour always of 60 minutes, a minute, while almost always consists of 60 seconds, sometimes it can be a period of 59 or 61 seconds. ![]()
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