WeekFiscalToDate ( Yearnr ; WeeknrOfYear ; Firstweekday )

Calculate date from fiscal-weeknumber and year

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Menno van Beek - Show more from this author
Van Beek Zakelijke Software
https://www.vbzs.nl

Sample input:

WeekFiscalToDate ( 2013 ; 5 ; 2 )
WeekFiscalToDate ( 2015 ; 5 ; 1 )
WeekFiscalToDate ( 2015 ; 5 ; 2 )

Sample output:

1/28/2013
2/1/2015
1/26/2015

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

/* 
###########################################
# WeekFiscalToDate function
# Author:
# Menno van Beek - Van Beek Zakelijke Software - Woerden, the Netherlands
# 
# Format:   
# WeekFiscalToDate ( Yearnr ; WeeknrOfYear ; Firstweekday )
# 
# Parameters:
# Yearnr       =    between 1 and 4000 
# WeeknrOfYear =    any natural number, limited only by the resulting date
# Firstweekday =    1…7 (sunday…saturday)
# 
# Data type returned:
# Date calculated from the given fiscal weeknumber in the given year 
# at the given Firstweekday
#    
# Description:   
# This function works more or less as the inverse function of 
# WeekOfYearFiscal(), which
# is built into Filemaker. Only instead of calculating the weeknumber, it 
# calculated the date
# for the given day of the given weeknr.
# 
# Other use:
# You can also use this function to calculate a particular occurrence of 
# a day in a given month:
# WeekFiscalToDate ( Year ; 
#        WeekOfYearFiscal ( 
#               Date ( Month ; 7 * occurrence ; Year ) ; Firstweekday ) ; 
#                         Firstweekday )
# 
# February 24, 2013
###########################################
*/

Let( [ 

      Dd1Yr = Date ( 1 ; 1 ; Yearnr ) ; 
      Dy1Wk1 = DayOfWeek ( Dd1Yr - Firstweekday ) ; 
      WeekOfYear1 = WeekOfYearFiscal ( Dd1Yr ; Firstweekday ) ; 
      Dd1Wk1 = Dd1Yr - Dy1Wk1 + If ( WeekOfYear1 > 1 or Dy1Wk1 = 7 ; 7 ) 

] ; 

      Dd1Wk1 + ( WeeknrOfYear - 1 ) * 7 

)

This function works more or less as the inverse function of WeekOfYearFiscal(), which is built into Filemaker. Only instead of calculating the weeknumber, it calculates the date for the given day of the given fiscal weeknr. If the Firstweekday is set to 2 it'll calculate a date from the ISO-weeknumber.

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

WeekFiscalToDate ( Yearnr ; WeeknrOfYear ; Firstweekday )

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