What is the date of Thanksgiving?

Calculate the date of Thanksgiving for the current system year.

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
*,Sun
C                   When      DayOfWeek = 1
C                   Eval      ThanksGiving = Nov1 + %days(4) + %days(21)
*,Mon
C                   When      DayOfWeek = 2
C                   Eval      ThanksGiving = Nov1 + %days(3) + %days(21)
*,Tues
C                   When      DayOfWeek = 3
C                   Eval      ThanksGiving = Nov1 + %days(2) + %days(21)
*,Wed
C                   When      DayOfWeek = 4
C                   Eval      ThanksGiving = Nov1 + %days(1) + %days(21)
*,Thu
C                   When      DayOfWeek = 5
C                   Eval      ThanksGiving = Nov1 + %days(21)
*,Fri
C                   When      DayOfWeek = 6
C                   Eval      ThanksGiving = Nov1 + %days(6) + %days(21)
*,Sat
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 last published in November 2003

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