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Time offset from GMT [1] Notes; Prior until 1907 UTC+04:28:12: Karachi Time (KART) 1907–1951 UTC+05:30: Indian Standard Time (IST) 1951–1971 UTC+05:00 in West Pakistan UTC+06:00 in East Pakistan (today Bangladesh) Karachi Time (KART) Dacca Time (DACT) 1971–present UTC+05:00 in Pakistan: Pakistan Standard Time (PKT)
This is a list representing time zones by country. Countries are ranked by total number of time zones on their territory. Time zones of a country include that of dependent territories (except Antarctic claims). France, including its overseas territories, has the most time zones with 12 (13 including its claim in Antarctica and all other counties ).
Observed DST (commonly referred to as British Summer Time (BST)) since 1916. Year-round Summer Time (BST) + Double Summer Time (BDST) 1940–1945. Two-stage Double Summer Time (BDST) 1947. Year-round Summer Time (BST) 1968–1971. Follows European Union practice, although no longer a member. United States
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+8), Cuba Standard Time (UTC−5), and (North American) Central Standard Time (UTC−6), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in an earlier ...
On 15 September 1951, following the findings of mathematician Mahmood Anwar, two time zones were introduced. Karachi Time (KART) was introduced in West Pakistan by subtracting 30 minutes from UTC+05:30 to UTC+05:00 , while Dacca Time (DACT) was introduced in East Pakistan by subtracting 30 minutes off UTC+06:30 to UTC+06:00 .
Pale colours: Standard time observed all year Dark colours: Summer time observed During British Summer Time (BST), civil time in the United Kingdom is advanced one hour forward of Greenwich Mean Time (GMT), in effect changing the time zone from UTC+00:00 to UTC+01:00, so that mornings have one hour less daylight, and evenings one hour more.
In terms of time usage, both the 24-hour clock and 12-hour clock are widely used in the country. The 12-hour notation is widely used in daily life, written communication, and is used in spoken language. The 24-hour notation is used in situations where there would be widespread ambiguity.
The dates of British Summer Time are the subject of the Summer Time Act 1972 (c. 6). From 1972 to 1980, the day following the third Saturday in March was the start of British Summer Time (unless that day was Easter Sunday, in which case BST began a week earlier), with the day following the fourth Saturday in October being the end of British ...