1. iMore Question's Avatar
    the week numbers in the iPad calendar are wrong. For 2016 week 1 starts on December 28, 2015, but the correct start date is January 4, 2016.
    03-03-2015 04:14 PM
  2. kch50428's Avatar
    Not according to the ISO standards. ISO 8601 - Wikipedia, the free encyclopedia

    First week
    The ISO 8601 definition for week 01 is the week with the year's first Thursday in it. Mutually equivalent definitions would be possible based on the following properties of this week:

    It is the first week with a majority (4 or more) of its days in January.
    Its first day is the Monday nearest to 1 January.
    It has 4 January in it. Hence the earliest possible dates are 29 December through 4 January, the latest 4 through 10 January.
    It has the year's first working day in it, if Saturdays, Sundays and 1 January are not working days.
    If 1 January is on a Monday, Tuesday, Wednesday or Thursday, it is in week 01. If 1 January is on a Friday, it is part of week 53 of the previous year; if on a Saturday, it is part of week 52 (or 53 if the previous year was a leap year); if on a Sunday, it is part of week 52 of the previous year.
    03-03-2015 04:24 PM
  3. MartinMartinMartin's Avatar
    I think you need to re-read your Wikipedia quote.
    iOS is definitely wrong on its week numbers.
    January 1 2016 is on a Friday, so it is part of week 53 of the previous year. Week 1 2016 starts on Monday, January 4 (the first week with 4 or more days in January).
    01-07-2016 09:16 AM

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