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The main purpose of this page is to list the current standard time offsets of different countries, territories and regions. Information on daylight saving time or historical changes in offsets can be found in the individual offset articles (e.g. UTC+01:00) or the country-specific time articles (e.g. Time in Russia).
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.
Time zones of the world. 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.
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).
Armenia and Azerbaijan used this as daylight saving time (DST) in 1981–2012 and 1981–2016 respectively, called Armenia Summer Time (AMST) and Azerbaijan Summer Time (AZST). Discrepancies between official UTC+05:00 and geographical UTC+05:00
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.
Since 2002, Pakistan has implemented Daylight Saving Time (DST) multiple times, adjusting local time from UTC+05:00 to UTC+06:00 during different summer periods. In 2002, DST was observed from the first Sunday in April (April 7) at 00:00 to the first Sunday in October (October 6) at 00:00.