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
  
  

==================================
MORE INFORMATION ON THIS TOPIC
==================================

The Best Web Links: tips, tutorials and more.

Ask your programming questions--or help out your peers by answering them--in our live discussion forums.

Ask the Experts yourself: Our application development gurus are waiting to answer your programming questions.

This was first published in November 2003

Dig deeper on iSeries CL programming

0 comments

Oldest 

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

SearchEnterpriseLinux

SearchDataCenter

Close