Memorial Day Offer

Discover your mystery discount!

Time zone

Group 1: Time Zone Basics – Time zones are areas with uniform standard time for legal, commercial, and social purposes. – Each time zone is […]

« Back to Glossary Index

Group 1: Time Zone Basics
– Time zones are areas with uniform standard time for legal, commercial, and social purposes.
– Each time zone is defined by an offset from Coordinated Universal Time (UTC).
– Offsets range from UTC-12:00 to UTC+14:00.
– Some areas adjust their offset during daylight saving time.
– Time zones follow country boundaries rather than longitude.

Group 2: History and Evolution of Time Zones
– In the 19th century, railways adopted Greenwich Mean Time.
– Quirico Filopanti and Sir Sandford Fleming proposed 24 hourly time zones in the 19th century.
– Almost all inhabited places adopted standard time zones by 1900.
– Standard time zones were proposed for North American railroads.
– Time zones were essential for transportation and communication advancements.

Group 3: Time Zone Systems and Conversions
– Countries gradually shifted to hourly time zones based on GMT or UTC.
– Conversion between time zones follows a specific relationship.
– Equation for time conversion can be rearranged.
– Nautical time zones and date line follow specific rules.
– Some countries still use unique time zones with offsets like 30 minutes.

Group 4: Daylight Saving Time
– Many countries adopt daylight saving time (DST) during part of the year.
– DST typically involves advancing clocks by an hour in spring.
– Modern DST was first proposed in 1907 and widely used since 1916.
– Countries around the equator usually do not observe DST.
– DST details vary by location and change occasionally.

Group 5: Time Zones in Technology and Space
– Web servers display times based on local time or UTC.
– Operating systems like Unix and Windows handle time zone information.
– Programming languages like Java, Perl, and PHP support time zone handling.
– Orbiting spacecraft may experience multiple sunrises and sunsets in a day.
– Space exploration often synchronizes time with the launch site or mission control.

Time zone (Wikipedia)

A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.

Time zones of the world

Each time zone is defined by a standard offset from Coordinated Universal Time (UTC). The offsets range from UTC−12:00 to UTC+14:00, and are usually a whole number of hours, but a few zones are offset by an additional 30 or 45 minutes, such as in India and Nepal. Some areas in a time zone may use a different offset for part of the year, typically one hour ahead during spring and summer, a practice known as daylight saving time (DST).

« Back to Glossary Index
This site uses cookies to offer you a better browsing experience. By browsing this website, you agree to our use of cookies.