In leap years the week number is the rank number of its Doomsday. The extra week is sometimes referred to as a leap week, although ISO 8601 does not use this term. Disadvantages edit The year number of the ISO week very often differs from the Gregorian year number for dates close to 1 January. Of these, the pairs 10/45, 11/46, 12/47, 15/28, 16/29, 37/50 and 38/51 share their days also in leap years. For example, the Gregorian date 31 December 2006 corresponds to the Sunday of the 52nd week of 2006, and is written 2006-W52-7 (in extended form) or 2006W527 (in compact form). Calculation edit Calculating the week number of a given date edit The week number of any date can be calculated, given its ordinal date (i.e. Examples of contemporary dates around New Years Day Date Notes Gregorian ISO Sat 2004-W53-6 Sun 2004-W53-7 Sat 2005-W52-6 Sun 2005-W52-7 Mon 2006-W01-1 Sun 2006-W52-7 Mon 2007-W01-1 Both years 2007 start with the same day.
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The weeks 09, 1926, 31 and 35 never share their days of the month with any other week of the same year. The same is true for every Thursday. In the US and in most of Latin America, although the work week is usually defined to start on Monday, the week itself is often considered to start on Sunday. To the day of 13 Jan 14 Feb 3 Mar 4 Apr 5 May 6 Jun 7 Jul 8 Aug 9 Sep 10 Oct 11 Nov 12 Dec i Add Leap year Algorithm od 30 ( m - 1) floor (0.6 ( m 1). Its last day is the Sunday nearest to 31 December. Sun 2008-W52-7 Mon 2009-W01-1 ISO year 2009 begins three days before the end of Gregorian 2008. It has 28 December. If it is on a Sunday, it is part of week 52 of the previous year. Most calendar reform proposals using leap week calendars are simpler in this regard, although they may choose a different leap cycle. If 31 December is on a Monday, Tuesday or Wednesday, it is in week 01 of the next year. For 26 September 2008 ceil ( 7) 39 ( ) mod 7 5 od 30 (9 - 1) floor (0.6 (9 1) c (8 floor (8 - 1 4) 5 x 00 - 1) mod 7 1 ceil (270 1 7) 39 271 mod. All week-numbering years start with a Monday and end with a Sunday.
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