ISO Week Date - Relation With The Gregorian Calendar - Examples

Examples

Date Notes
day month year iso date iso week date
Sat 1 Jan 2005 2005-01-01 2004-W53-6
Sun 2 Jan 2005 2005-01-02 2004-W53-7
Sat 31 Dec 2005 2005-12-31 2005-W52-6
Mon 1 Jan 2007 2007-01-01 2007-W01-1 Both years 2007 start with the same day.
Sun 30 Dec 2007 2007-12-30 2007-W52-7
Mon 31 Dec 2007 2007-12-31 2008-W01-1
Tue 1 Jan 2008 2008-01-01 2008-W01-2 Gregorian year 2008 is a leap year, ISO year 2008 is 2 days shorter: 1 day longer at the start, 3 days shorter at the end.
Mon 29 Dec 2008 2008-12-29 2009-W01-1
Wed 31 Dec 2008 2008-12-31 2009-W01-3
Thu 1 Jan 2009 2009-01-01 2009-W01-4
Thu 31 Dec 2009 2009-12-31 2009-W53-4 ISO year 2009 has 53 weeks, extending the Gregorian year 2009, which starts and ends with Thursday, at both ends with three days.
Sun 3 Jan 2010 2010-01-03 2009-W53-7
Thu 31 Dec 2009 2009-12-31 2009-W53-4 For 2009/2010 the ISO week-numbering year is three days into the next Gregorian year.
Fri 1 Jan 2010 2010-01-01 2009-W53-5
Sat 2 Jan 2010 2010-01-02 2009-W53-6
Sun 3 Jan 2010 2010-01-03 2009-W53-7
Sun 28 Dec 2008 2008-12-28 2008-W52-7 For 2008/2009 where the ISO week-numbering year is three days into the previous Gregorian year.
Mon 29 Dec 2008 2008-12-29 2009-W01-1
Tue 30 Dec 2008 2008-12-30 2009-W01-2
Wed 31 Dec 2008 2008-12-31 2009-W01-3
Thu 1 Jan 2009 2009-01-01 2009-W01-4

Read more about this topic:  ISO Week Date, Relation With The Gregorian Calendar

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