Par2: Week of year -- ISO 8601 2003-01-30 -- Paulo Theodoro ! Número da Semana - Padrao ISO 8601 Week Number - ISO 8601
Standard
! Semana começa na segunda Week start on Monday
! A primeira quinta sempre é da semana 1 First thursday
allways on first week
! 4 de Janeiro sempre é da semana 1 January, 4 allways
on first week
Week# = 0
Day# = DAY(Datein) ; Month# = MONTH(Datein) ; Year# = YEAR(DateIn)
First_Day# = (DATE(1,1,Year#) % 7) + 1
IF First_Day# < 6
NumOf_Days# = First_Day# + 4
ELSE
CASE First_Day#
OF 6 ; NumOf_Days# = 3
OF 7 ; NumOf_Days# = 4
OF 1 ; NumOf_Days# = 5
END
END
Days_Year# = DATE(month#,day#,year#) - DATE(1,1,year#) + 1
All_Days# = Days_Year# + NumOf_Days#
Week# = INT(All_Days# / 7)
IF Week# < 1
CASE (DateIn % 7 + 1)
OF 1 ; Week# = NumeroSemana(DateIn - 3)
OF 6 ; Week# = NumeroSemana(DateIn - 1)
OF 7 ; Week# = NumeroSemana(DateIn - 2)
OF 3 OROF 4 OROF 5 ; Week# = 1
ELSE ; Week# = 53
END
ELSIF Week# = 53
IF DAY(DateIn) > 28 AND (DateIn % 7 + 1) = 2
Week# = 1
ELSIF DAY(DateIn) > 29 AND (DateIn % 7 + 1) = 3
Week# = 1
ELSIF DAY(DateIn) > 30 AND (DateIn % 7 + 1) = 4
Week# = 1
END
END
RETURN Week#
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