WeekDayCountInMonth ( countThisWeekDayNum, dateInMonth )

Returns the number of times a given weekday number appears in the month of the specified date.

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Daniel A. Shockley
New York Hotel Trades Council
http://hotelworkers.org

Sample input:

WeekDayCountInMonth ( 4, Date ( 8; 12; 2015 ) )

Sample output:

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

// WeekDayCountInMonth ( countThisWeekDayNum, dateInMonth )
// version 1.0, Daniel A. Shockley

// Returns the number of times a given weekday number appears in the month of the specified date. 

/* 
VERSION HISTORY:
	1.0 (2015-08-12-dshockley) - first created. 
*/

Let ( [ 
	  monthBegin = date ( month ( dateInMonth ); 1; year ( dateInMonth ) )
	; monthEnd = date ( month ( dateInMonth ) + 1; 0; year ( dateInMonth ) )
]; 

Div ( ( DayOfWeek ( monthBegin - countThisWeekDayNum ) + monthEnd - monthBegin ); 7 )

)

It can be useful to know things like "How many Thursdays are there in the calendar month August 2015?" This function allows you to answer that question easily. It's a simple algorithm I found on a page about Excel function somewhere.
You send in the week-day-number (i.e. 4, if you want to count Thursdays), along with some date (any date!) within the calendar month you want to check.
Another example, to find the number of today's day-of-week in today's month, would be:

WeekDayCountInMonth (
DayOfWeek ( Get ( CurrentDate ) )
; Get ( CurrentDate )
)

Comments

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

WeekDayCountInMonth ( countThisWeekDayNum, dateInMonth )

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