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dst = (-src) AND src: BLSMSK reg,r/m: VEX.LZ.0F38 F3 /2: Generate a bitmask of all-1s bits up to the lowest bit position with a 1 in the source argument. Returns all-1s if source argument is 0. Equivalent to dst = (src-1) XOR src: BLSR reg,r/m: VEX.LZ.0F38 F3 /1: Copy all bits of the source argument, then clear the lowest set bit. Equivalent to
Daylight saving time (DST), also referred to as daylight saving(s), daylight savings time, daylight time (United States and Canada), or summer time (United Kingdom, European Union, and others), is the practice of advancing clocks to make better use of the longer daylight available during summer so that darkness falls at a later clock time.
The Ohio Clock in the U.S. Capitol being turned forward for the country's first daylight saving time on March 31, 1918 by the Senate sergeant at arms Charles Higgins.. Most of the United States observes daylight saving time (DST), the practice of setting the clock forward by one hour when there is longer daylight during the day, so that evenings have more daylight and mornings have less.
Standard Time (SDT) and Daylight Saving Time (DST) offsets from UTC in hours and minutes. For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset. The UTC offsets are based on the current or upcoming database rules.
The tz database is published as a set of text files which list the rules and zone transitions in a human-readable format. For use, these text files are compiled into a set of platform-independent binary files—one per timezone.
DST ends on the second Sunday of March and starts on the third Sunday of October. In 2007, DST started on October 15, 2006, and ended on March 11, 2007. In 2010, Paraguay changed its own DST rules because of the energy crisis, ending DST on the second Sunday in April, a month later than previous years. The start date remains unchanged.
Observed DST with annual time changes in 1973–1978 and 1985–2011, permanently in 2012–2013, with annual time changes in 2014–2022, and permanently since 2022. Kazakhstan: 2004: Observed DST in 1981–1990 and 1992–2004. Kosovo: Observed DST 1941–1945 and since 1983 when it was part of Yugoslavia, Serbia and Montenegro, Serbia or ...
DST is observed in parts of this time zone. The Atlantic Time Zone is a geographical region that keeps standard time—called Atlantic Standard Time ( AST )—by subtracting four hours from Coordinated Universal Time ( UTC ), resulting in UTC−04:00 .