What is the date of Thanksgiving?

This code will help you to calculate the date of Thanksgiving for the current system year.

H NoMain
*,Procedure Prototype
D ThanksGiving    PR              D

P ThanksGiving    B                   Export
*,Procedure Interface
D ThanksGiving    PI              D
D DayOfWeek       S              2  0
D YrsPassed       S              4  0
D Nov1            S               D   datfmt(*ISO)
D ISO_Today       S               D   datfmt(*ISO)
D Thanksgiving    S               D   datfmt(*ISO)
D SatDay          S               D   datfmt(*ISO) inz(D'2003-10-04')

*,Make variable Nov1 the first day of November for the current year
C                   Time                    ISO_Today
C                   Eval      YrsPassed = %subdt(ISO_Today:*Y)-2000
C                   Eval      Nov1 = D'2000-11-01' + %years(YrsPassed)

*,DayOfWeek 1=Sunday, 2=Monday........
*,If 0 then it is Saturday, make it 7
C                   Eval      DayOfWeek = %rem(%diff(Nov1:SatDay:*D):7)
C                   If        DayOfWeek = 0
C                   Eval      DayOfWeek = 7
C                   EndIf

*,The following will take the first day of November
*,add the number of days to get the first Thursday
*,and then add 3 week to get the 4th Thursday.
C                   Select
C                   When      DayOfWeek = 1
C                   Eval      ThanksGiving = Nov1 + %days(4) + %days(21)
C                   When      DayOfWeek = 2
C                   Eval      ThanksGiving = Nov1 + %days(3) + %days(21)
C                   When      DayOfWeek = 3
C                   Eval      ThanksGiving = Nov1 + %days(2) + %days(21)
C                   When      DayOfWeek = 4
C                   Eval      ThanksGiving = Nov1 + %days(1) + %days(21)
C                   When      DayOfWeek = 5
C                   Eval      ThanksGiving = Nov1 + %days(21)
C                   When      DayOfWeek = 6
C                   Eval      ThanksGiving = Nov1 + %days(6) + %days(21)
C                   When      DayOfWeek = 7
C                   Eval      ThanksGiving = Nov1 + %days(5) + %days(21)
C                   EndSL

C                   Return    ThanksGiving

P ThanksGiving    E


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This was first published in November 2003

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