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Language: VB7
Expertise: Intermediate
Jun 30, 2003

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# GetRoshHashanah - Retrieving the date that Rosh Hashanah begins in the requested year

``````' Returns the date that Rosh Hashanah begins for the requested year.
' It is important to note that Rosh Hashanah is based on the Lunar cycle so the
' Holiday actually begins at sunset of the day before the date returned by this
' function.

' Note: Many dates in the Jewish calendar are dependent on the date of Rosh
' Hashanah just as Good Friday, Lent, and other dates are dependent on Easter.

Function GetRoshHashanah(ByVal iYear As Integer) As Date
Dim dDate As Single, iDate As Integer, iDayOfWeek As Integer
Dim JY, JtoG, iMonth As Integer

' Conversion factors
Const F1 As Single = 765433 / 492480
Const F2 As Single = 23269 / 25920
Const F3 As Single = 765433 / 492480

JY = (12 * ((iYear Mod 19) + 1)) Mod 19

' Correct from Julian date to Gregorian date
JtoG = iYear \ 100 - iYear \ 400 - 2

dDate = JtoG + F1 * JY + (iYear Mod 4) / 4 - (313 * CLng(iYear) + 89081) / _
98496

' Get the integer portion of the date
iDate = CInt(Math.Floor(dDate))
' Get the fractional portion of the date
dDate = dDate - iDate

If iDate > 30 Then
iDate = iDate - 30
iMonth = 10
ElseIf iDate < 1 Then
iDate = iDate + 31
iMonth = 8
Else
iMonth = 9
End If

iDayOfWeek = (New Date(iYear, iMonth, iDate).DayOfWeek) + 1

' Postponement Rules
' If day of week is Sunday, Wednesday, or Friday
If iDayOfWeek = 1 OrElse iDayOfWeek = 4 OrElse iDayOfWeek = 6 Then
iDate = iDate + 1
' If day is Monday
ElseIf iDayOfWeek = 2 AndAlso dDate > F1 AndAlso JY > 11 Then
iDate = iDate + 1
' If day is Tuesday we may need to add two days
ElseIf iDayOfWeek = 3 AndAlso dDate >= F2 AndAlso JY > 6 Then
iDate = iDate + 2
End If

If iDate > 30 Then
iDate = iDate - 30
iMonth = 10
ElseIf iDate < 1 Then
iDate = iDate + 31
iMonth = 8
Else
iMonth = 9
End If

Return New Date(iYear, iMonth, iDate)
End Function``````
Jim Edgar

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