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Time zone map showing the misalignment of Iceland's time zone Björg Þorleifsdóttir, a lecturer at the Faculty of Medicine at the University of Iceland, noted in 2014 that humans' circadian rhythms , the natural internal process that regulates the human sleep–wake cycle , is naturally determined by the solar time of where a person lives.
The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, and the state of Quintana Roo in Mexico. Places that use: Eastern Standard Time (EST), when observing standard time (autumn/winter), are five hours behind Coordinated Universal Time (UTC−05:00).
UTC−04:00 is an identifier for a time offset from UTC of −04:00. It is observed in the Eastern Time Zone (e.g., in Canada and the United States) during the warm months of daylight saving time, as Eastern Daylight Time. The Atlantic Time Zone observes it during standard time (cold months).
The IANA time zone database identifier is Africa/Addis_Ababa. [2] Ethiopia does not observe daylight saving time. [3] Date and time notation.
In Canada, the provinces of New Brunswick, [1] Nova Scotia, [2] and Prince Edward Island are in this zone, though legally they calculate time specifically as an offset of four hours from Greenwich Mean Time (GMT–4) rather than from UTC. Small portions of Quebec (eastern Côte-Nord and the Magdalen Islands) also observe Atlantic
In communications messages, a date-time group (DTG) is a set of characters, usually in a prescribed format, used to express the year, the month, the day of the month, the hour of the day, the minute of the hour, and the time zone, if different from Coordinated Universal Time (UTC).
Most Big Four affiliates in the Eastern and Pacific time zones follow this early evening newscast model as well, running a 90-minute block of news from 5:00 to 6:30 p.m., particularly if they run a network's national evening newscast at 6:30 p.m. Eastern and Pacific Time.
Central European Summer Time (CEST, UTC+02:00), sometimes referred to as Central European Daylight Time (CEDT), [1] is the standard clock time observed during the period of summer daylight-saving in those European countries which observe Central European Time (CET; UTC+01:00) during the other part of the year.