Since 2/30/2012 is not a valid date, it evaluates the DATE(2012,2,30) as 3/1/2012 instead of 2/30/2012
It would have similar issues with each month with 30 days (April, June, September, November) if the first day of the following month were to fall on the day being tallied (For instance, the number of Thursdays in November, 2011) It may mean that the formula requires some modification. Paul ----------------------------------------- “Do all the good you can, By all the means you can, In all the ways you can, In all the places you can, At all the times you can, To all the people you can, As long as ever you can.” - John Wesley ----------------------------------------- ________________________________ From: DaveO <dmo...@gmail.com> To: MS EXCEL AND VBA MACROS <excel-macros@googlegroups.com> Sent: Thu, November 3, 2011 1:58:26 PM Subject: $$Excel-Macros$$ Formula to count Fridays in a month mis-reports February I've written this formula to count Fridays in a month, where cell b1 contains a date such as 11/1/2011: =SUMPRODUCT(--(WEEKDAY(DATE(YEAR(B1),MONTH(B1),ROW($A$1:$A$31)))=6)) This formula works for any month except February. Can anyone suggest a reason why this happens? -- FORUM RULES (925+ members already BANNED for violation) 1) Use concise, accurate thread titles. Poor thread titles, like Please Help, Urgent, Need Help, Formula Problem, Code Problem, and Need Advice will not get quick attention or may not be answered. 2) Don't post a question in the thread of another member. 3) Don't post questions regarding breaking or bypassing any security measure. 4) Acknowledge the responses you receive, good or bad. 5) Cross-promotion of, or links to, forums competitive to this forum in signatures are prohibited. NOTE : Don't ever post personal or confidential data in a workbook. Forum owners and members are not responsible for any loss. ------------------------------------------------------------------------------------------------------ To post to this group, send email to excel-macros@googlegroups.com -- FORUM RULES (925+ members already BANNED for violation) 1) Use concise, accurate thread titles. Poor thread titles, like Please Help, Urgent, Need Help, Formula Problem, Code Problem, and Need Advice will not get quick attention or may not be answered. 2) Don't post a question in the thread of another member. 3) Don't post questions regarding breaking or bypassing any security measure. 4) Acknowledge the responses you receive, good or bad. 5) Cross-promotion of, or links to, forums competitive to this forum in signatures are prohibited. NOTE : Don't ever post personal or confidential data in a workbook. Forum owners and members are not responsible for any loss. ------------------------------------------------------------------------------------------------------ To post to this group, send email to excel-macros@googlegroups.com
