` Printed Icetips Article

Icetips Article

Par2: Week of year
2001-01-17 -- Pascal Gulikers

Actually, this is the correct one:

CLC_WEE        PROCEDURE  (pDate)               ! Declare Procedure
lThisThursday        LONG
lFirstThursday       LONG
  CODE
  ! weekno's according to ISO 8601:

  ! - week starts at monday
  ! - first thursday of year is always in week 1
  ! - 4th of Januari always in week 1

  if pDate < 1 then return(0).

  lThisThursday  = pDate - ((pDate - 1) % 7) + 3
  lFirstThursday = date(1,1,year(lThisThursday)) + 6 -
((date(1,1,year(lThisThursday)) + 2) % 7)

  return((lThisThursday - lFirstThursday) / 7 + 1)

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