Can i count the number of Mondays in a specific month with a formula?

Hi
I am looking for a streamlined way of calculating an amount to invoice for a job that I am paid for weekly, but for which I invoice monthly, meaning that I am invoicing different amounts each month, depending on how many Mondays fall in a given month (i.e. 4 or 5).
So I am wondering if there is a function I can use to calculate the number of Mondays in a given month automatically and then I can use this value to multiply by my weekly charge to calculate the amount to invoice each month.
Thanks
Nick

Responses below apply to my earlier post.
nick_harambee wrote:
1. What part of the formula do I need to change to do the same for other days of the week, and for other years?
No change for other years, as the full date is entered.
I haven't looked at changes necessary to the version above to show results for other days. See below for a new table that does all days.
2. Would it be possible to construct one table with the calendar for a whole year, which would generate a count for each day of the week, which I could then use as and when needed? Or would it make more sense to construct a separate table for each day of the week (as I am referring to in question 1)?
Depends what information you need.
If you need the count for only one week day, then a table showing only the count for that day of week will avoid having to search it out.
If you need the number of occurrences of each weekday in each month, then a table showing those, with or without an attached calendar, is in order.
Here's one that shows the count of each weekday for each month. It uses two formulas, derived from the earlier posts by Yvan and Jerry:
B1: =DATE($A,COLUMN()-1,1)
B2: =IF(AND(DAY(EOMONTH(B$1,0))>28,MOD(WEEKDAY(EOMONTH(B$1,0))+7-(ROW()-1),7)<(DAY( EOMONTH(B$1,0))-28)),5,4)
The formula in B1 is filled right to M1, and the cells are formatted to show only the Month and Year. Note that the cells actually contain Date and Time values, which are used in the second formula's calculations.
The formula in B2 is filled right to M2 and Down to M8.
Day names in column A are entered directly and are not used in the calculations.
The 4 digit year number is entered directly in A1. Change this number to change the year.
<img src="http://i963.photobucket.com/albums/ae116/Barry_images/iWork09screen/Countw eekdaysinMonth.png" border="0" alt="Count of weekdays in month(s)">
Conditional formatting is used to fill cells whose value is equal to 5 with a yellow background.
Regards,
Barry
Edit:
Direct address to image for use if not showing above.
http://i963.photobucket.com/albums/ae116/Barry_images/iWork09screen/Countweekday sinMonth.png
Message was edited by: Barry

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Count the number of mondays in a specific month

Hey guys,
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I hope that this one will help :
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I choose this way to start to be able to check with different dates.
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Yvan KOENIG (VALLAURIS, France) samedi 6 août 2011 23:33:10
iMac 21”5, i7, 2.8 GHz, 4 Gbytes, 1 Tbytes, mac OS X 10.6.8 and 10.7.0
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Can i count the number of Mondays in a specific month with a formula?

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