DayCounterHolidays ( Date_Start ; Date_End ; Days_of_Week ; Holidays )

Counts number of types of days between 2 dates excluding holidays

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Josh Morton - Show more from this author
JEM CONSULTING

Sample input:

_DayCounter ( Date ( 1 ; 1 ; 2010 ) ; Date ( 1 ; 31 ; 2010 ) ; "2¶4" ; "1/1/2011¶1/17/2011)

Sample output:

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

/*_DayCounterHolidays ( Date_Start ; Date_End; Days_of_Week ; Holidays )

Modified by Tyler Tullock to respect list of holidays

Author
Joshua Morton - JEM Consulting

Parameters
Date_Start - any calendar date;
Date_End - any calendar date;
Days_of_Week - a list of days of week (as numbers), separated by carriage returns (1=Sunday, 7 = Saturday);
Holidays - a list of dates that should NOT be counted.

Data type returned
number
Description
Returns a number counting only those days in the specified range whose day-of-week is included in the weekDays parameter and whose date does NOT exist in a list called Holidays.

Thanks to Michael Horak, *COMMENT Visual Realisation for their inspiration

January, 11, 2011

*/


Case ( 
Date_Start and not IsEmpty ( FilterValues ( DayOfWeek ( Date_Start ) ; Days_of_Week ) ) and  IsEmpty (FilterValues (Date_Start ; Holidays)) ; 

1 )

 + 

Case ( 
Date_Start < Date_End ; 
_DayCounterHolidays ( Date_Start + 1 ; Date_End ; Days_of_Week ; Holidays )

)

Returns a number counting only those days in the specified range whose day-of-week is included in the weekDays parameter and whose date does NOT exist in a list called Holidays.

For example to calculate how many lesson a music student will have during a semester based on the day of the week they take lessons and a date range but taking into account holidays.

Comments

		Bernard Cheang, Singapore Jan 11, 2011
Shouldn't the sample output be 8?

		Jack Rodgers, FmpApps Mar 2, 2011
Custom Functions have the problem of not being flexible and impossible to debug if the solution is locked. Using a table to list holidays or days to exclude is more flexible and eliminates discrimination. Suppose one person celebrates a religious holiday that another doesn't. Whose holiday is accepted and whose isn't? Or if your db is used in a different country. Would Britain celebrate the US's July 4th? Using a filtered portal one can adapt to these issues.

		Joshua Morton, NYC Mar 2, 2011
You can set the Holiday to be a list(field) and then it could pull from data any end users could maintain in your solution. You could do something similar to decide which days to count.

		Pablo D, Quito/Ecuador Jun 18, 2013
Can you suggest a custom function for the calculation for an EndDate given a starting date, the number of days, days of week, and holidays? EndDate ( Date_Start ; Days ; Days_of_Week ; Holidays ) Thanks in advance

		wameed, independent high of electoral commission May 1, 2020
ther is a problem with this function

		Josh Morton, JEM CONSULTING May 1, 2020
What is the problem with this function? Been working for years - but haven't tested it with new versions of FMP although none of the calcs have changed?

		David Kerns, Cabinet Max Dec 9, 2022
Can't get a Holiday List to work, Can you tell me how to format it?

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

DayCounterHolidays ( Date_Start ; Date_End ; Days_of_Week ; Holidays )

Comments

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