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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.
Pakistan has experimented with Daylight Saving Time (DST) a number of times since 2002, shifting local time from UTC+05:00 to UTC+06:00 during various summer periods. Daylight saving time in Pakistan has not been observed since 2009. Daylight Saving Time starts on 9 February 2025 and ends on 7 September 2025.
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.
Metric time is the measure of time intervals using the metric system. The modern SI system defines the second as the base unit of time, and forms multiples and submultiples with metric prefixes such as kiloseconds and milliseconds. Other units of time – minute, hour, and day – are accepted for use with SI, but are not part of it
TT differs from Geocentric Coordinate Time (TCG) by a constant rate. Formally it is defined by the equation = +, where TT and TCG are linear counts of SI seconds in Terrestrial Time and Geocentric Coordinate Time respectively, is the constant difference in the rates of the two time scales, and is a constant to resolve the epochs (see below).
Thus, the length of the traditional pahar varied from about 2.5 hours to 3.5 hours in the Indo-Gangetic plains. [2] Each pahar of a 24-hour day-night cycle has a specific name and number. [2] The first pahar of the day, known as pehla pahar (Hindustani: pehla, lit. 'first'), corresponds to the early morning and sunrise. [4]
Karachi Time (Urdu: کراچی وقت, abbreviated as KART, LMT or Local Mean Time) was a time zone set at UTC+04:28:12 ahead of Greenwich Mean Time and observed prior until 1907 in Karachi. The local time was established by the Karachi Chamber of Commerce & Industry .
24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of ...