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#1
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WEEKNUM() Question
The results of WEEKNUM() don't correspond with the calendaring system I
want. My first question is simple: How does the WEEKNUM() algorithm work? If I can figure out what it's based on, I can probably match it to the calendar I'm using. It looks like it's anywhere from 1 day off to 2 days off from my calendar, depending on when my week decides to start. The calendar I have starts on Mondays and assigns WEEK-1 to the first week of January with at least 4 days in it. So if WEEKDAY(DATE(YEAR,1,1),2) is 5 (Friday) or greater, then the week doesn't start until WEEKDAY() yields 1. This means that up to first 4 days of January would be considered WK 52 (or 53). I started to wonder if there was a better way to do it, when my formula started approaching 150 characters, and I still hadn't accounted for the WK 53 case or leap year. I've never built my own function, but something tells me it would be the cleanest way to do it. I have a pdf of about 15 years worth, if anyone is interested in taking a look. Since it's .5MB, I won't try to attach it. <http://www.capeyork.us/data/Calendar.pdf. Thanks in advance to the first "smart-guy" to help me out. I've been hoping to make time to figure this out for quite a while now. |
#2
Posted to microsoft.public.excel,microsoft.public.excel.worksheet.functions
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WEEKNUM() Question
Read this:
http://www.cpearson.com/excel/weeknum.htm -- Kind regards, Niek Otten Microsoft MVP - Excel "Jared Call" wrote in message ... | The results of WEEKNUM() don't correspond with the calendaring system I | want. | | My first question is simple: How does the WEEKNUM() algorithm work? If I | can figure out what it's based on, I can probably match it to the calendar | I'm using. It looks like it's anywhere from 1 day off to 2 days off from my | calendar, depending on when my week decides to start. | | The calendar I have starts on Mondays and assigns WEEK-1 to the first week | of January with at least 4 days in it. So if WEEKDAY(DATE(YEAR,1,1),2) is 5 | (Friday) or greater, then the week doesn't start until WEEKDAY() yields 1. | This means that up to first 4 days of January would be considered WK 52 (or | 53). | | I started to wonder if there was a better way to do it, when my formula | started approaching 150 characters, and I still hadn't accounted for the WK | 53 case or leap year. I've never built my own function, but something tells | me it would be the cleanest way to do it. | | I have a pdf of about 15 years worth, if anyone is interested in taking a | look. Since it's .5MB, I won't try to attach it. | <http://www.capeyork.us/data/Calendar.pdf. | | Thanks in advance to the first "smart-guy" to help me out. I've been hoping | to make time to figure this out for quite a while now. | |
#3
Posted to microsoft.public.excel,microsoft.public.excel.worksheet.functions
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WEEKNUM() Question
I think you are referring to ISO week numbers.
Try this formula for calculating that week number =INT((A1-DATE(YEAR(A1-WEEKDAY(A1-1)+4),1,3)+WEEKDAY(DATE(YEAR(A1-WEEKDAY(A1- 1)+4),1,3))+5)/7) -- HTH Bob Phillips (replace somewhere in email address with gmail if mailing direct) "Jared Call" wrote in message ... The results of WEEKNUM() don't correspond with the calendaring system I want. My first question is simple: How does the WEEKNUM() algorithm work? If I can figure out what it's based on, I can probably match it to the calendar I'm using. It looks like it's anywhere from 1 day off to 2 days off from my calendar, depending on when my week decides to start. The calendar I have starts on Mondays and assigns WEEK-1 to the first week of January with at least 4 days in it. So if WEEKDAY(DATE(YEAR,1,1),2) is 5 (Friday) or greater, then the week doesn't start until WEEKDAY() yields 1. This means that up to first 4 days of January would be considered WK 52 (or 53). I started to wonder if there was a better way to do it, when my formula started approaching 150 characters, and I still hadn't accounted for the WK 53 case or leap year. I've never built my own function, but something tells me it would be the cleanest way to do it. I have a pdf of about 15 years worth, if anyone is interested in taking a look. Since it's .5MB, I won't try to attach it. <http://www.capeyork.us/data/Calendar.pdf. Thanks in advance to the first "smart-guy" to help me out. I've been hoping to make time to figure this out for quite a while now. |
#4
Posted to microsoft.public.excel,microsoft.public.excel.worksheet.functions
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WEEKNUM() Question
See also
http://www.rondebruin.nl/weeknumber.htm and http://www.rondebruin.nl/isodate.htm -- Regards Ron de Bruin http://www.rondebruin.nl "Jared Call" wrote in message ... The results of WEEKNUM() don't correspond with the calendaring system I want. My first question is simple: How does the WEEKNUM() algorithm work? If I can figure out what it's based on, I can probably match it to the calendar I'm using. It looks like it's anywhere from 1 day off to 2 days off from my calendar, depending on when my week decides to start. The calendar I have starts on Mondays and assigns WEEK-1 to the first week of January with at least 4 days in it. So if WEEKDAY(DATE(YEAR,1,1),2) is 5 (Friday) or greater, then the week doesn't start until WEEKDAY() yields 1. This means that up to first 4 days of January would be considered WK 52 (or 53). I started to wonder if there was a better way to do it, when my formula started approaching 150 characters, and I still hadn't accounted for the WK 53 case or leap year. I've never built my own function, but something tells me it would be the cleanest way to do it. I have a pdf of about 15 years worth, if anyone is interested in taking a look. Since it's .5MB, I won't try to attach it. <http://www.capeyork.us/data/Calendar.pdf. Thanks in advance to the first "smart-guy" to help me out. I've been hoping to make time to figure this out for quite a while now. |
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