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DayWeekYear2Date ( dayNR ; weekNR ; yearNR )

Turns DayNr. WeekNr. & Year into a Date

  Average rating: 3.9 (49 votes) Log in to vote

Arjen van der Ree Maxperts http://www.maxperts.nl

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

Let ( [ // determine the typical week-offset in [week 5] of the year [yearNR] . . . $checkdate = GetAsDate (Date (1 ; 1 ; yearNR) + (7 * 5 ) ) ; $checkweek = WeekOfYearFiscal ($checkdate ; 2) ; $wkoffset = 5 - $checkweek ; //make sure that we stay away from week 52/53 in correctional-data; we keep the remaining 21 days in a var $saveweekNR = Case (weekNR > 50 ; weekNR - 3 ; weekNR ) ; $reservedays = Case ( weekNR > 50 ; 21 ; 0 ) ; //first leap to the aproximate date as a basic startpoint, find the right offset for the day-nr. $leapdate = GetAsDate (Date ( 1 ; 1; yearNR) + (7 * ($saveweekNR-$wkoffset) ) ) ; $dayoffset = DayOfWeek ($leapdate) - dayNR ; //maandag = 2 ... vrijdag = 6 //First try (FT) to get close to a plausible date on the right day-nr.: $FTdate = GetAsDate ($leapdate-$dayoffset) ; $FTweek = WeekOfYearFiscal ($FTdate ; 2) ; // Second Correction (SC) with a plausible date, offset is in days (weekoffset x 7) $SCoffset = ($saveweekNR - $FTweek) * 7 ] ; GetAsDate ($FTdate + $SCoffset + $reservedays) // $reservedays :: if we put 2 week aside to stay away from week 52/53 we need to put them back here ! ) Click to copy

In many overviews (calendars e.g.) users want to use week numbers & years to see a set of days (mon - fri). This function makes is easy to translate from week-numbers, years and day-numbers (2=monday ... 6 = friday) to calculate say 5 dates to relate to records/portals in a week view.
I couldn't find anything like this on the internet and it took quite some time and testing to get is to work properly.
[dayNR ; 2 .. 5 (mon - fri) ]
[weekNR ; 1 ... 53*
[yearNR ; any year that Filemaker supports ]

*week-number 53 will goto wk 1 the following year in most cases.

 

Comments

		comment, VR Dec 25, 2011
Couldn't this be simpler? See: http://www.briandunning.com/cf/229

		Peter Bouma, Amsterdam Mar 18, 2016
I'm not happy with the declaration of script variables ($...) in this function. They should remain local/private within the Let statement of this CF. One way to mark them as private is to use '~' or '@' (in fact anything different from '$' or '$$') instead of the '$' prefix used here.

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