Comments on: ISO Year http://www.dailydoseofexcel.com/archives/2010/02/04/iso-year/ Daily posts of Excel tips…and other stuff Thu, 09 Feb 2012 18:06:07 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Blair http://www.dailydoseofexcel.com/archives/2010/02/04/iso-year/#comment-43866 Blair Thu, 11 Feb 2010 01:18:00 +0000 http://www.dailydoseofexcel.com/?p=3543#comment-43866 <p>Before you led me via Ron to D Maher's & C Pearson's efficient calculation for ISO Week Number, I had created an elaborate UDF based on VBA's DatePart function. If anyone else has gone down that road, you should know there is a bug waiting for you.</p> <div style="overflow: auto; white-space: nowrap;" class="codecolorer-container vb default"><div style="white-space: nowrap;" class="vb codecolorer">DatePart(<span class="st0">"ww"</span>, theDate, vbMonday, vbFirstFourDays)</div></div> <p>gives a good ISO week number, except for these dates (in my sample range):<br> 1991-12-30<br> 2003-12-29<br> 2007-12-31<br> 2019-12-30<br> 2031-12-29<br> The function returns week 53 (day 1). The day following each correctly returns week 01 (day 2).<br> (I'm Excel 2003 on XP)</p> <p>There's another glitch at 2101-01-02, but I haven't investigated, gonna go with the slick formula instead.<br> Thanks!</p> Before you led me via Ron to D Maher’s & C Pearson’s efficient calculation for ISO Week Number, I had created an elaborate UDF based on VBA’s DatePart function. If anyone else has gone down that road, you should know there is a bug waiting for you.

DatePart(“ww”, theDate, vbMonday, vbFirstFourDays)

gives a good ISO week number, except for these dates (in my sample range):
1991-12-30
2003-12-29
2007-12-31
2019-12-30
2031-12-29
The function returns week 53 (day 1). The day following each correctly returns week 01 (day 2).
(I’m Excel 2003 on XP)

There’s another glitch at 2101-01-02, but I haven’t investigated, gonna go with the slick formula instead.
Thanks!

]]> By: Redge http://www.dailydoseofexcel.com/archives/2010/02/04/iso-year/#comment-43764 Redge Sun, 07 Feb 2010 03:57:00 +0000 http://www.dailydoseofexcel.com/?p=3543#comment-43764 <p>This is a very timely update (no pun intended). As we become increasingly global in our businesses, having to deal with dates has been quite an interesting ordeal. I also read the original page and found it to be informative and useful.</p> <p>Thank you for taking the time to share the solution and the spreadsheet.</p> This is a very timely update (no pun intended). As we become increasingly global in our businesses, having to deal with dates has been quite an interesting ordeal. I also read the original page and found it to be informative and useful.

Thank you for taking the time to share the solution and the spreadsheet.

]]> By: Ron de Bruin http://www.dailydoseofexcel.com/archives/2010/02/04/iso-year/#comment-43727 Ron de Bruin Fri, 05 Feb 2010 19:42:00 +0000 http://www.dailydoseofexcel.com/?p=3543#comment-43727 <p>Hi Dick</p> <p>FYI</p> <p>I will update the page/workbook when I am ready with some stuff I am working now<br> I have a few other formulas also that are shorter for ISO that I want to add</p> Hi Dick

FYI

I will update the page/workbook when I am ready with some stuff I am working now
I have a few other formulas also that are shorter for ISO that I want to add

]]> By: Ron de Bruin http://www.dailydoseofexcel.com/archives/2010/02/04/iso-year/#comment-43724 Ron de Bruin Fri, 05 Feb 2010 19:24:00 +0000 http://www.dailydoseofexcel.com/?p=3543#comment-43724 <p>Hi Dick</p> <p>The formula examples on my page are based on the year and you are correct that<br> you see strange results when the date is before 4-jan-2010 if your input is a date.</p> Hi Dick

The formula examples on my page are based on the year and you are correct that
you see strange results when the date is before 4-jan-2010 if your input is a date.

]]>