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The ISO week date system is effectively a leap week calendar system that is part of the ISO 8601 date and time standard issued by the International Organization for Standardization (ISO) since 1988 (last revised in 2019) and, before that, it was defined in ISO (R) 2015 since 1971.
2011 was a common year starting on Saturday of the Gregorian calendar, the 2011th year of the Common Era (CE) and Anno Domini (AD) designations, the 11th year of the 3rd millennium and the 21st century, and the 2nd year of the 2010s decade.
April 8 – President Obama, House Republicans and Senate Democrats agree on a week-long stopgap spending bill preventing a government shutdown resulting from a failure to pass the 2011 federal budget. [84] April 10 – 2011 Masters Tournament: South African Charl Schwartzel won the 2011 event by two strokes over Adam Scott and Jason Day. [85 ...
Similarly, the last ISO week of a year may have up to three days that are actually in the Gregorian calendar year that is starting; if three, they are Friday, Saturday, and Sunday. The Thursday of each ISO week is always in the Gregorian calendar year denoted by the ISO week-numbering year. Examples: Monday 29 December 2008 is written "2009-W01-1"
Weeks This page was last edited on 1 January 2022, at 23:46 (UTC) . Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ; additional terms may apply.
Breguet classique Grand complication perpetual calendar. Offices and retail establishments often display devices containing a set of elements to form all possible numbers from 1 through 31, as well as the names/abbreviations for the months and the days of the week, to show the current date for convenience of people who might be signing and dating documents such as checks.
A week is defined as an interval of exactly seven days, [b] so that, except when passing through daylight saving time transitions or leap seconds, 1 week = 7 days = 168 hours = 10,080 minutes = 604,800 seconds. With respect to the Gregorian calendar: 1 Gregorian calendar year = 52 weeks + 1 day (2 days in a leap year)
September 11 is the 254th day of the year (255th in leap years) in the Gregorian calendar; ... (1389–92): The Teutonic Knights begin a five-week ... 2011 – Andy ...