Talk:4–4–5 calendar

Suggestion to move this page
This would sit better within accounting period which already explains the 445 concept. Toby64 (talk) 12:47, 31 October 2020 (UTC)

13 times 4 weeks calendar
Should also mention 13x4 calendar, which has 13 periods of 4 weeks for the year, with the "extra" period usually put into the final quarter or second half. To compare: 4-4-5 calendar has the following annual pattern 4-4-5,4-4-5,4-4-5,4-4-5, whereas 13x4 has 4-4-4,4-4-4,4-4-4,4-4-4-4. Some major european retailers use this calendar type. It has the same need for a 53rd week as 4-4-5, usually added to the extra period 13 but sometimes managed as a 14th period of 1 week. —Preceding unsigned comment added by 78.105.60.169 (talk) 22:31, 11 May 2011 (UTC)

Week 53 in ISO
-- 157.157.92.142 (talk) 10:27, 17 February 2012 (UTC)
 * 28. December 1998 - 3. January 1999 is week 53 of 1998
 * 27. December 2004 - 2. January 2005 is week 53 of 2004
 * 28. December 2009 - 3. January 2010 is week 53 of 2009
 * 28. December 2015 - 3. January 2016 is week 53 of 2015
 * 28. December 2020 - 3. January 2021 is week 53 of 2020

patterns in policy usage
I am just trying to get a firmer grasp on this topic. I am hoping someone who monitors this page can help with my questions. Are there any patterns in either location or divisions of industry for the way they set up their 4-4-5 calendars? Or in other words, do most industries in Fictitioustan who use a 445 calendar start their year on the Monday closest to the 1st of Jan, but in Pretendonia most industries who use a 445 calendar tend to start on the Wednesday on or before Feb 1st? Or is it more closely related to industry, ie most widget manufacturers on a 445 start on the first Monday closest to Oct 1st, but most FooBar manufacturers start their 445 on the Friday closest to Dec 5th? Or is it a combination of the two, ie most widget manufacturers in Pretendonia on a 445 start on the first Monday closest to Oct 1st whereas most widget manufacturers in Fictitioustan on a 445 start on the first Monday on or after Nov 1st? Or is there no pattern at all? Thanks for your time. — Preceding unsigned comment added by 67.61.170.246 (talk) 20:40, 19 March 2019 (UTC)

Error about relationship with ISO 8601
In 4-4-5 calendar, I think this sentence might be wrong:

"For Saturday, this ends up being equivalent to the week-date rule from ISO 8601 which ensures that the first week of the year contains four or more days (i.e. its majority) of that year, which includes the first Thursday and January 4."

I believe the week-date rule from ISO 8601 would correspond to using the Sunday nearest the end of year, not Saturday. Could someone double check this? — Preceding unsigned comment added by Snackematician (talk • contribs) 16:59, 28 December 2023 (UTC)
 * I think this assertion is based on the corollary for the example, which you didn’t quote: “the first fiscal week of the following year is the one that includes September 4”, because the ISO rule is often quoted as requiring W01 to include 4 January. However, it’s not 100% applicable, because the US fiscal rules assume a Sunday–Saturday week and ISO uses Monday–Sunday, of course.
 * As you can see in the overview table below, this is true except if the 4th day is a Sunday (case D). In case C, two Saturdays are equally close to the last day of the last month, but the prose states that the earlier one is selected, which is part of that month.
 * The table also shows where the two US rules then differ: cases D, E and F. — Christoph Päper 13:36, 3 January 2024 (UTC)