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Par2: Week of year 2001-01-17 -- Kevin Dunsford Note - this does not use Mod because its origins were in Clarion 2003 where
% did not always work correctly. It is now for C5. It takes into
consisderations the requirements of ISO 2051.
Kevin
MEMBER('qse.clw') ! This is a MEMBER
module
MAP
INCLUDE('QSE098.INC'),ONCE !Local module
prodecure declarations
END
FWeekNumber PROCEDURE ( Pdate ) ! Declare Procedure
loc:Resultstr string(7) ! Returned Result = 'YYYYWWW'
Loc:Result Long ! Returned as a long
loc:date Long ! Day of year in Clarion standard date form.
loc:Year Long ! Long Year that the week belongs to - Passed by
Reference
loc:aMonday byte(1) ! First day of the first week of year = Monday
loc:aThursday byte(4) ! Day number for thursday
loc:WeekNo Long ! Week no of loc:Year returned. Note: loc:Year
may be
! either the year of the date, the previous year or
the next year
loc:Week1Date Long ! Calculated date of first week of current year
loc:PrevWeek1 Long ! Previous year week 1 date
loc:NextWeek1 Long ! Next Year week 1 date
CODE
! PROC YEARWEEK
! For a given date - returns the Year and week number of the
year
! in a 7 digitstring YYYYWWW all places significant.
! Note, the Year is a 4 digit year that the week is in
! according to ISO 2051 where the first week of the year
must contain 4
! or more days of that year.
! IE: The first thursday in the new year is in the first
week of the year.
! The week begins on the monday preceeding that first
thursday which
! may be either in the current year or previous year.
!
! NOTE: The year in YYYYWWW may be different from the date
year!!!
! Note the week value may be from 1 to 53.
! ie: a week may span the year end and is allocated to
which
! ever year 4 or more of its days occur in.
! Refer Croxley Publishing tel: 828-7169.
! ---------
If | USE TODAY'S DATE
( Not pdate )
loc:date = Today()
else ! DATE PASSED
Loc:Date = pDate
end ! Pos todays date
Loc:Year = Year(loc:Date)
! Calculate Week 1 date for current year
loc:Week1Date = Date(1,1,Year(loc:date) ) ! CURRENT YEAR
Loop ! FIRST THURSDAY IN YEAR
If loc:Week1Date - ( Int(loc:Week1Date/7) * 7) =
loc:aThursday then break.
loc:Week1Date += 1
end ! First Thursday
loc:Week1Date -= 3 ! Previous Monday
! Calculate Week 1 date for Previous year
loc:PrevWeek1 = Date(1,1,Year(loc:date)-1 )
Loop ! FIRST THURSDAY IN YEAR
If loc:PrevWeek1 - ( Int(loc:PrevWeek1/7) * 7) =
loc:aThursday then break.
loc:PrevWeek1 += 1
end ! First Thursday
loc:PrevWeek1 -= 3 ! Previous Monday
! Calculate Week 1 date for Next year
loc:NextWeek1 = Date(1,1,Year(loc:date)+1 )
Loop ! FIRST THURSDAY IN YEAR
If loc:NextWeek1 - ( Int(loc:NextWeek1/7) * 7) =
loc:aThursday then break.
loc:NextWeek1 += 1
end ! First Thursday
loc:NextWeek1 -= 3 ! Previous Monday
If | DATE IN PREVIOUS YEAR
( loc:date < loc:Week1Date )
loc:Year = Year(loc:date) - 1
loc:WeekNo = INT( (loc:date - loc:PrevWeek1 ) / 7 ) + 1
elsif | DATE IN NEXT YEAR
( loc:date >= loc:NextWeek1 )
loc:Year = Year(loc:date) + 1
loc:WeekNo = INT( (loc:date - loc:NextWeek1 ) / 7 ) + 1
else ! DATE IS IN CURRENT YEAR
loc:Year = Year(loc:date)
loc:WeekNo = INT( (loc:date - loc:Week1Date ) / 7 ) + 1
end ! Year
loc:ResultStr = Format( loc:Year,@n_04 ) &
Format(loc:WeekNo,@n_03)
If clip(Loc:ResultStr) <> '' then Loc:Result = Loc:ResultStr
else Loc:Result = 0.
return( loc:Result ) ! ---------------------------------------
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