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FindNextWeekday ( startDate ; dayofweeknumber )

Finds the next or previous week date from starting date

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Rob Poelking - Show more from this author Kiza Solutions https://kizasolutions.com

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

//FindNextWeekday ( startDate ; DayofWeekNumber ) /* Purpose: with a given start date, calculates the date of the provided DayOfWeek * for example. FindNextWeekday ( Date ( 9 ; 7 ; 2016) ; 5 ) returns Thursday, 9/8/2016 * Day of week is specified numerically from 1-7 starting from Sunday. Specifying * a negative day of week will return the previous date. * FindNextWeekday ( Date ( 11 ; 6 ; 2018 ) ; -1 ) returns Sunday 11/4/2108. * Author: Rob Poelking rob@excelisys.com * History: * v3 2019-01-22 Rob Poelking - corrected when the date and selected day of weeek were the same. * v2 2018-11-06 Rob Poelking - revised to allow negative day of week for previous date * v1 2016-06-13 Rob Poelking */ Let ([ /* UNIT TESTING */ //startDate = Date ( 10 ; 6 ; 2018 ) ; //DayOfWeekNumber = 7 ; /* END UNIT TESTING */ ~date = startDate ; ~startDay = DayOfWeek ( ~date ) ; ~dow = Abs(DayofWeekNumber); ~delta = ~dow - ~startDay ; ~dir = Choose ( DayOfWeekNumber > 0 ; -1 ; 1 ) ; ~err = ValueCount ( Filter ( "1234567" ; ~dow )) = 0 ] ; Case ( ~dir < 0 and ~delta ≥ 0 ; ~date + ~delta - 7 ; ~dir > 0 and ~delta > 0 ; ~date + ~delta ; ~date + 7 ) ) Click to copy

with a given start date, calculates the date of the provided DayOfWeek
for example. FindNextWeekday ( Date ( 9 ; 7 ; 2016) ; 5 ) returns Thursday, 9/8/2016
Day of week is specified numerically from 1-7 starting from Sunday. Specifying
a negative day of week will return the previous date. FindNextWeekday ( Date ( 11 ; 6 ; 2018 ) ; -1 ) returns Sunday 11/4/2108.

 

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