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Topic: ISO week date

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Encyclopedia: ISO 8601 Week dates are dates in which a day is determined by counting within a week. Weeks are given two digits beginning with 01 as the first week of the year, up to 52 or 53 being the last week of the year (see below.) Days are given one digit beginning with 1 as Monday leading to 7 as Sunday. On the Internet, ISO 8601 is used by the W3C, defining a profile of the standard that restricts the supported formats to reduce the chance of error and the complexity of software. www.nationmaster.com /encyclopedia/ISO-8601

Calendar - Wikipedia, the free encyclopedia January always has exactly 5 weeks (Sunday through Saturday), February has 4 weeks, March has 4 weeks, etc. Note that this calendar will normally need to add a 53rd week to every 5th or 6th year, which might be added to December or might not be, depending on how the organization uses those dates. A fiscal calendar (such as a 5/4/4 calendar) fixes each month at a specific number of weeks to facilitate comparisons from month to month and year to year. week and the Julian day used by astronomers. en.wikipedia.org /wiki/Calendar

Week Numbers In Excel To compute the ISO week number of a date in cell A1, use the following formula, provided by Laurent Longre. An absolute week number is the 7 day period that a date falls within, based solely on the first day of the year, regardless of the day of the week. This function return the week number of a date, based on a week starting on either Sunday or Monday. www.cpearson.com /excel/weeknum.htm

On the Origin Of Spam An analysis of spam received at a set of spam traps during the week of Monday February 16th 2004 (ISO week number 08, from Monday February 16th 2004 to Sunday February 22th 2004 inclusive). An analysis of spam received at a set of spam traps during the week of Monday February 9th 2004 (ISO week number 07, from Monday February 9th 2004 to Sunday February 15th 2004 inclusive). An analysis of spam received at a set of spam traps during the week of Monday February 2nd 2004 (ISO week number 06, from Monday February 2nd 2004 to Sunday February 8th 2004 inclusive). www.db.org /spam

Home Page for Calendar Reform Half-years have an equal number of days only in leap-years; the year never divides evenly into quarters; the months are irregular; and neither the year nor the months can be divided regularly into weeks. Emperor Constantine then reformed the calendar in the 4th century, by introducing the seven-day week, probably modeled on the Christian sabbatical cycle. With the lengths of the year and months established, the Julian Calendar still preserved the Roman Kalends, Nones and Ides for the divisions within the months. www.personal.ecu.edu /mccartyr/calendar-reform.html

International Standard Date and Time Notation If a date and a time value are stored together in a single data field, then ISO 8601 suggests that they should be separated by a latin capital letter T, as in 19951231T235959. ISO 8601 is only specifying numeric notations and does not cover dates and times where words are used in the representation. Week 01 of a year is per definition the first week that has the Thursday in this year, which is equivalent to the week that contains the fourth day of January. www.cl.cam.ac.uk /~mgk25/iso-time.html

ISO - International Organization for Standardization ISO 8601:2000 is based on, incorporates and cancels a variety of previous standards with a view to achieving one simple, logical and coherent format for all dates, times, and periods of time requiring to be represented. For instance a specification might want to define that a certain field containing the date and time of an event should do so in the format: YYYYMMDDhhmm with the exclusion of all other formats allowed by ISO 8601. ISO 8601 will find usage in computer programmes, logbooks, contest entries, QSL cards, magazine reports, Web pages, e-mail, statistics, forms of all kinds, administrations and businesses, in customs and transportation, in e-commerce and academia, and in all types of international activity. www.iso.ch /iso/en/prods-services/popstds/datesandtime.html

Week Numbering There's also Perl library code to return the time since the epoch of the start of the week given the week number, which can be used with Perl code to return the date of the start of the week given the week number. However there are often problems at the year transition - such as returning week 00 instead of the last week (52/53) of the previous year, or changing from week 53 to week 01 part way through the week. ISO make their money from paper copies of standards, so the standard itself is not on line. www.adsb.co.uk /date_and_time/week_numbers

ISO Dates ISO actually talks about the first Thursday because it's the middle day of the ISO week, but remembering 4 January is easier for calculations. For ISO, all weeks commence on Mondays and end on a Sunday. Or, to put it another way, the first week of the year contains at least four days of January. www.bygsoftware.com /examples/iso_dates.htm

About the ISO Week Date Calendar The program initially displays the current ISO Week Date and tables showing the position of the current date in the current year. The ISO 8601 rule is: The first week of the year is the week containing the first Thursday. ISO has not sanctioned an alternative to the Gregorian Calendar currently used by most of the world. personal.ecu.edu /mccartyr/aboutwdc.htm

TrayDay - Date in tray, Calendar, Week number & Internet Time utility lets you see the date at a glance, and has a handy pop-up calendar with week numbers. TrayDay - Date in tray, Calendar, Week number & Internet Time utility Choose Sunday or Monday as first day of week www.mjmsoft.com /trayday.htm

Calendar Weeks - J R Stockton If one considers a pseudo-year, exactly 51 weeks shorter, of 8 or 9 days, the result becomes more evident, since every week within an "ISO week number year" has its Thursday within the corresponding Calendar year. Week Number 1 may be the first week partly, mostly, or fully in the calendar year; or later. Week Numbers can be calculated from first principles. www.merlyn.demon.co.uk /weekinfo.htm

Various Calendar Programs The Zeller's congruence method is the name of a well-known algorithm that computes the day of the week of a given date, from the numeric values of day, month and year. Then, the original code to compute the day of the week corresponding to a given date was also wrong in some cases and I had to rewrite it (for programming notes, see later the section labeled "The Zeller's congruence method"). In addition, there are many other possible definitions of the Week 1 of a year (from which the other weeks follow naturally); companies often choose their own standards, it seems, and they are sometimes quite different. wwwcdf.pd.infn.it /MLO/Calendars/Notes.html

The Call "He has to carry the battle of iso week in and week out, and he finally got to run behind someone else and have a big day," said Hauser. "I was injured the past few weeks, so it was nice to get back in and do something." Strobel made his own fortune with his big TD run a few minutes later. www.woonsocketcall.com /site/news.cfm?newsid=13157922&BRD=1712&PAG=461&dept_id=106787&rfi=6

The Mathematics of the ISO 8601 Calendar ISO Week Date Conversion Algorithm : General algorithm written by Rick McCarty. Although the bulk of the standard deals with the proposal to introduce a uniform and unambiguous notation for representing calendar dates and the times of the day, it also provides standards for defining the day number in a week (assumed to start on Monday) and the week number in a year. ISO 8601 Date and Time - Converting and Implementing : Provides computer algorithms for implementing the ISO 8601 standard. www.fys.ruu.nl /~vgent/calendar/isocalendar.htm

Week using ISO Standard Finding the Monday of a selected week (weeks calculated via ISO Standard): The following formula allows the user to pick a year and a week number, and have the formula calculate the Monday (or any other day) of that week. The number at the end of the last line determines the day of the week that is returned as the final result. www.kenhamady.com /form21.html

How do you calculate the week number in a year of a given date? , sunday -> 6 %END REM Dim n As Integer n = Weekday( tmpdate) If n = 1 Then ' sunday to end of week n = n + 7 End If CalculateIsoWeekday = n - 2 End Function Week #1 is the week that contains the 4th of January (ISO 8601). The week at the end/beginning of the year belongs to the next/previous year, if there are 3 days or less of that week in the year in question. haikal.free.fr /notes/howweek.html

ISO: Six Week Raisin Bran Muffins Have been searching in vain for the recipe for what are called Six Week Raisin Bran Muffins. It makes a large batch and will keep in the refrigerator for up to 6 weeks...hence the name. Uses a box of raisin bran and buttermilk...Unfortunately lost my copy. www.recipelink.com /gm/0/51051

Fiscal year, ISO week, part 1 Given a date and the date of the corresponding fiscal New Year's Day, computing the ISO week is just a matter of counting the days between them and dividing by seven. The trickiest part is determining what is "corresponding fiscal New Year's Day," because, as you pointed out, September 1 may be in week one of the new year, or it may be in week 52 or 53 of the old year. If the resulting number (disregarding any fractional part) is n, the week is n+1. www.searchoracle.com /ateQuestionNResponse/0,289625,sid41_cid552564_tax294651,00.html

AskTom "Date range per week" Let me show you my problem with one example: I'm grounping by "iso" week and there is one date (31-12-2003, for example) that iso week is 01, so if iso week is 1, then I need that month be 1, quarter be 1 and year (iso year) be 2004. In my example, the 31-12-2003 will not be computed in 2003 year if we've grouped by iso week and then we've grouped by month. It is a direct consequence of ISO week definition as precised by ISO itself "Week 01 of a year is per definition the first week that has the Thursday in this year, which is equivalent to the week that contains the fourth day of January". asktom.oracle.com /pls/ask/f?p=4950:8:2838763416311408735::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:7482139067917

ISO 8601 This document describes the ISO standard for numerical date/time interchange formats, 8601:1988, which supersedes the ISO standards: 2014, 2015, 2711, 3307 and 4031. A week begins with a Monday, and the first week of a year is the one which includes the first Thursday, or equivalently the one which includes January 4. Any particular date/time format is a subset of these possible values, and the standard lists various permissible subsets. www.mcs.vuw.ac.nz /technical/software/SGML/doc/iso8601/ISO8601.html

PX : RFU week number week 53 of the previous year, and the next week is week 1. Week number of year with Monday as first day of the week 'Week X3' and the fifth Saturday in March is called 'Week X7 px.sklar.com /code.html?id=875

ISO Week - ISO Week Number 26 is from June 24 to 31. - ISO Week Number 52 is from December 24 to 31.   The week has seven days during common year (June 24 – 30) and eight days during leap year (June 24 – 31). www.geocities.com /peacecrusader888/isoweek.htm

JSI Tip 7081. What is the ISO week number and day for a given date? What is the ISO week number and day for a given date? Using Day.bat, I have scripted Week.bat to determine the ISO Year, ISO Week, and ISO Day of a given date. 7081 » What is the ISO week number and day for a given date? www.jsifaq.com /subo/tip7000/rh7081.htm

CALENDAR DATABASE Each date entered will be converted to: Julian day number; Day of week; Gregorian calendar; Julian calendar; Jewish calendar; and the French republican calendar. Displays the current week and day of the year and converts dates to week-date format. This WWW page allows you to convert dates among various calendar systems. www.greatdreams.com /calndr2.htm

Date-ISO-1.28.readme iso $iso = iso($year, $month, $day); AUTHOR Rich Bowen (rbowen@rcbowen.com) DATE $Date: 2001/08/23 02:04:00 $ Additional comments For more information about this calendar, please see: http://personal.ecu.edu/mccartyr/ISOwdALG.txt http://personal.ecu.edu/mccartyr/isowdcal.html http://personal.ecu.edu/mccartyr/aboutwdc.htm http://www.cl.cam.ac.uk/~mgk25/iso-time.html http://www.fourmilab.ch/documents/calendar/ Finally, many many many thanks to Rick McCarty who provided me with the algorithms that I'm using for conversions to and from ISO dates. ISO date format also supports a variety of time formats. I suppose I should accept those as valid arguments. ftp.port80.se /pub/CPAN/authors/Richard_Bowen/Date-ISO-1.28.readme

mysql Archive: Re: Formatting dates as ISO week number - how? MySQL has a week formatting option that formats dates as week number, i.e. >> I need to format output to a CGI perl script as #week ISO (first week of the year is the week with four or more days on it, or the first week with thursday on it). week #1 is the week with 1st of January on it, and this is not what I need. www.exweblogic.com /bitmechanic/mail-archives/mysql/current/2422.html

WeberDev.com -> Code Archive -> Function get_week_number which returns the week number of the given date according to ISO 8601:1988, also includes a function is_leap_year. Function get_week_number which returns the week number of the given date according to ISO 8601:1988, also includes a function is_leap_year. WeberDev.com -> Code Archive -> Function get_week_number which returns the week number of the given date according to ISO 8601:1988, also includes a function is_leap_year. If the week containing January 1 has four or more days in the new year, then it is considered week 1; otherwise, it is week 53 of the previous year, and the next week is week 1. www.weberdev.com /get_example.php3?count=470&mode=text

The Code Project - Gregorian Date To ISO Date Converter - C# Programming Week numbers in ISO 8601 are integers from 1 to 52 or 53; parts of week 1 may be in the previous calendar year; parts of week 52 may be in the following calendar year; and if a year has a week 53, parts of it must be in the following calendar year. The correct way to represent a week in ISO 8601 format is YYYY-WW. For example, if we wanted to know the ISO 8601 week number of the year, we need to create a new class for this implementation, as we can't extend the www.codeproject.com /csharp/gregtoiso.asp

Cal::Date - a simple set of calendar functions for Perl According to ISO, Monday is day 1 and Sunday day 7 in the week. This means that ISO_day won't work for dates after 29237-12-12, which we can probably live with, but that c gives a less astonishing result. This states that weeks begin on a Monday (day 1), and that the first week of a year is the one with 4 Jan in it. www.wildfire.dircon.co.uk /CalDate.html

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