Capital World, in 8 editions.

time difference: there are 21 World entities (20 countries and 1 dependency) with multiple time zones: Australia, Brazil, Canada, Chile, Democratic Republic of Congo, Ecuador, France, Greenland (part of the Danish Kingdom), Indonesia, Kazakhstan, Kiribati, Mexico, Micronesia, Mongolia, Netherlands, New Zealand, Papua New Guinea, Portugal, Russia, Spain, United States
note 1: in some instances, the time zones pertain to portions of a country that lie overseas
note 2: in 1851, the British set their prime meridian (0° longitude) through the Royal Observatory at Greenwich, England; this meridian became the international standard in 1884 and thus the basis for the standard time zones of the world; today, GMT is officially known as Coordinated Universal Time (UTC) and is also referred to as "Zulu time"; UTC is the basis for all civil time, with the world divided into time zones expressed as positive or negative differences from UTC
note 3: each time zone is based on 15° starting from the prime meridian; in theory, there are 24 time zones based on the solar day, but there are now upward of 40 because of fractional hour offsets that adjust for various political and physical geographic realities; see the Standard Time Zones of the World map included with the Reference Maps
daylight saving time: some 67 countries - including most of the world's leading industrialized nations - use daylight savings time (DST) in at least a portion of the country; China, Japan, India, and Russia are major industrialized countries that do not use DST; Asia and Africa generally do not observe DST and it is generally not observed near the equator, where sunrise and sunset times do not vary enough to justify it; some countries observe DST only in certain regions; for example, only southeastern Australia observes it; in fact, only a minority of the world's population - about 20% - uses DST

time difference: there are 21 World entities (20 countries and 1 dependency) with multiple time zones: Australia, Brazil, Canada, Chile, Democratic Republic of Congo, Ecuador, France, Greenland (part of the Danish Kingdom), Indonesia, Kazakhstan, Kiribati, Mexico, Micronesia, Mongolia, Netherlands, New Zealand, Papua New Guinea, Portugal, Russia, Spain, United States
note 1: in some instances, the time zones pertain to portions of a country that lie overseas
note 2: in 1851, the British set their prime meridian (0° longitude) through the Royal Observatory at Greenwich, England; this meridian became the international standard in 1884 and thus the basis for the standard time zones of the world; today, GMT is officially known as Coordinated Universal Time (UTC) and is also referred to as "Zulu time"; UTC is the basis for all civil time, with the world divided into time zones expressed as positive or negative differences from UTC
note 3: each time zone is based on 15° starting from the prime meridian; in theory, there are 24 time zones based on the solar day, but there are now upward of 40 because of fractional hour offsets that adjust for various political and physical geographic realities; see the Standard Time Zones of the World map included with the Reference World and Regional Maps
daylight saving time: some 67 countries - including most of the world's leading industrialized nations - use daylight savings time (DST) in at least a portion of the country; China, Japan, India, and Russia are major industrialized countries that do not use DST; Asia and Africa generally do not observe DST and it is generally not observed near the equator, where sunrise and sunset times do not vary enough to justify it; some countries observe DST only in certain regions; for example, only southeastern Australia observes it; in fact, only a minority of the world's population - about 20% - uses DST

time difference: there are 21 World entities (20 countries and 1 dependency) with multiple time zones: Australia, Brazil, Canada, Chile, Democratic Republic of Congo, Ecuador, France, Greenland (part of the Danish Kingdom), Indonesia, Kazakhstan, Kiribati, Mexico, Micronesia, Mongolia, Netherlands, New Zealand, Papua New Guinea, Portugal, Russia, Spain, United States
note 1: in some instances, the time zones pertain to portions of a country that lie overseas
note 2: in 1851, the British set their prime meridian (0° longitude) through the Royal Observatory at Greenwich, England; this meridian became the international standard in 1884 and thus the basis for the standard time zones of the world; World; today, GMT is officially known as Coordinated Universal Time (UTC) and is also referred to as "Zulu time"; UTC is the basis for all civil time, with the world World divided into time zones expressed as positive or negative differences from UTC
note 3: each time zone is based on 15° starting from the prime meridian; in theory, there are 24 time zones based on the solar day, but there are now upward of 40 because of fractional hour offsets that adjust for various political and physical geographic realities; see the Standard Time Zones of the World map included with the World and Regional Maps
daylight saving time: some 67 countries - including most of the world's World's leading industrialized nations - use daylight savings time (DST) in at least a portion of the country; China, Japan, India, and Russia are major industrialized countries that do not use DST; Asia and Africa generally do not observe DST and it is generally not observed near the equator, where sunrise and sunset times do not vary enough to justify it; some countries observe DST only in certain regions; for example, only southeastern Australia observes it; in fact, only a minority of the world's World's population - about 20% - uses DST

time difference: there are 21 World world entities (20 countries and 1 dependency) with multiple time zones: Australia, Brazil, Canada, Chile, Democratic Republic of Congo, Ecuador, France, Greenland (part of the Danish Kingdom), Indonesia, Kazakhstan, Kiribati, Mexico, Micronesia, Mongolia, Netherlands, New Zealand, Papua New Guinea, Portugal, Russia, Spain, United States
note 1: in some instances, the time zones pertain to portions of a country that lie overseas
note 2: in 1851, the British set their prime meridian (0° longitude) through the Royal Observatory at Greenwich, England; this meridian became the international standard in 1884 and thus the basis for the standard time zones of the World; world; today, GMT is officially known as Coordinated Universal Time (UTC) and is also referred to as "Zulu time"; UTC is the basis for all civil time, with the World world divided into time zones expressed as positive or negative differences from UTC
note 3: each time zone is based on 15° starting from the prime meridian; in theory, there are 24 time zones based on the solar day, but there are now upward of 40 because of fractional hour offsets that adjust for various political and physical geographic realities; see the Standard Time Zones of the World map included with the World and Regional Maps
daylight saving time: some 67 countries - -- including most of the World's world's leading industrialized nations - -- use daylight savings time (DST) in at least a portion of the country; China, Japan, India, and Russia are major industrialized countries that do not use DST; Asia and Africa generally do not observe DST DST, and it is generally not observed near the equator, where sunrise and sunset times do not vary enough to justify it; some countries observe DST only in certain regions; for example, only southeastern Australia observes it; in fact, only a minority of the World's world's population - -- about 20% - -- uses DST