Calculate U.S. holidays for any given year

This piece of code was written -- just as a starting point -- to perhaps, at some point, add holidays to your server's holiday list. This code is for the U.S. only.

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Option Public
Option Declare

Public Type Holiday
 Name As String
 Date As Variant
End Type

Sub Initialize

'See: http://www.vpcalendar.net/Holiday_Dates/Holiday_Determinations.html

 Dim holidays(17) As Holiday

 Dim tmpString As String
 Dim tmpDate As Variant
 Dim wkDay As Integer
 Dim holidayYear As Integer

 tmpString = Inputbox$("Enter year for 
list of USA holidays dates for 
that year")
 On Error Goto errHandler
 holidayYear = Cint(tmpString)
 tmpString = ""

 '===================================
 holidays(0).Name = "New Year's Day"
 'January 1 - Always
 tmpDate = Dateserial(holidayYear, 1, 1)
 holidays(0).Date = tmpDate
 '===================================

 '===================================
 holidays(1).Name = "Martin Luther King Jr Day"
 '3rd Monday in January - this means it can fall
 anywhere between Jan.
15 and Jan. 21
 tmpDate = Dateserial(holidayYear, 1, 15)
 wkDay = Weekday(tmpDate)
 holidays(1).Date = tmpDate - wkDay + 
2 'Subtract the current day, add 2
for Monday
 If wkDay > 2 Then
  holidays(1).Date = holidays(1).Date + 7 
'Add 7 to go to next
week
 End If
 '===================================

 '===================================
 holidays(2).Name = "Groundhog Day"
 'February 1 - Always
 tmpDate = Dateserial(holidayYear, 2, 2)
 holidays(2).Date = tmpDate
 '===================================

 '===================================
 holidays(3).Name = "Valentine's Day"
 'February 14 - Always
 tmpDate = Dateserial(holidayYear, 2, 14)
 holidays(3).Date = tmpDate
 '===================================

 '===================================
 holidays(4).Name = "President's Day"
 '3rd Monday in February - this means it can 
fall anywhere between Feb.
15 and Feb. 21
 tmpDate = Dateserial(holidayYear, 2, 15)
 wkDay = Weekday(tmpDate)
 holidays(4).Date = tmpDate - wkDay + 2 
'Subtract the current day, add 2
for Monday
 If wkDay > 2 Then
  holidays(4).Date = holidays(4).Date + 7 
'Add 7 to go to next
week
 End If
 '===================================

 '===================================
 holidays(5).Name = "St. Patrick's Day"
 'March 17 - Always
 tmpDate = Dateserial(holidayYear, 3, 17)
 holidays(5).Date = tmpDate
 '===================================

 '===================================
 holidays(7).Name = "Easter"
 holidays(7).Date = dateEaster(holidayYear)
 '===================================

 '===================================
 holidays(6).Name = "Good Friday"
 holidays(6).Date = holidays(7).Date - 2 
'Easter Sunday - 2 days for 
Good Friday
 '===================================

 '===================================
 holidays(8).Name = "Mother's Day"
 '2nd Sunday in May - this means it can fall 
anywhere between May 8 and 
May 14
 tmpDate = Dateserial(holidayYear, 5, 8)
 wkDay = Weekday(tmpDate)
 holidays(8).Date = tmpDate - wkDay + 1 
'Subtract the current day, add 1
for Sunday
 If wkDay > 1 Then
  holidays(8).Date = holidays(8).Date + 7 
'Add 7 to go to next
week
 End If
 '===================================

 '===================================
 holidays(9).Name = "Memorial Day"
 'Last Monday in May - this means it can fall 
anywhere between May 25 
and May 31
 tmpDate = Dateserial(holidayYear, 5, 25)
 wkDay = Weekday(tmpDate)
 holidays(9).Date = tmpDate - wkDay + 2 
'Subtract the current day, add 2
for Monday
 If wkDay > 2 Then
  holidays(9).Date = holidays(9).Date + 7 
'Add 7 to go to next 
week
 End If
 '===================================

 '===================================
 holidays(10).Name = "Father's Day"
 '3rd Sunday in June - this means it can fall 
anywhere between June 15 
and June 21
 tmpDate = Dateserial(holidayYear, 6, 15)
 wkDay = Weekday(tmpDate)
 holidays(10).Date = tmpDate - wkDay + 1 
'Subtract the current day, add 
1 for Sunday
 If wkDay > 1 Then
  holidays(10).Date = holidays(10).Date + 7
 'Add 7 to go to next
week
 End If
 '===================================

 '===================================
 holidays(11).Name = "Independence Day"
 'July 4 - Always
 tmpDate = Dateserial(holidayYear, 7, 4)
 holidays(11).Date = tmpDate
 '===================================

 '===================================
 holidays(12).Name = "Labor Day"
 '1st Monday in September - this means it can 
fall anywhere between
Sept. 1 and Sept. 7
 tmpDate = Dateserial(holidayYear, 9, 1)
 wkDay = Weekday(tmpDate)
 holidays(12).Date = tmpDate - wkDay + 2 
'Subtract the current day, add 
2 for Monday
 If wkDay > 2 Then
  holidays(12).Date = holidays(12).Date + 7
 'Add 7 to go to next
week
 End If
 '===================================

 '===================================
 holidays(13).Name = "Columbus Day"
 '2nd Monday in October - this means it can 
fall anywhere between Oct. 8 
and Oct. 14
 tmpDate = Dateserial(holidayYear, 10, 8)
 wkDay = Weekday(tmpDate)
 holidays(13).Date = tmpDate - wkDay + 2 
'Subtract the current day, add
2 for Monday
 If wkDay > 2 Then
  holidays(13).Date = holidays(13).Date + 7 
'Add 7 to go to next
week
 End If
 '===================================

 '===================================
 holidays(14).Name = "Halloween"
 'October 31 - Always
 tmpDate = Dateserial(holidayYear, 10, 31)
 holidays(14).Date = tmpDate
 '===================================

 '===================================
 holidays(15).Name = "Veteran's Day"
 'November 11 - Always
 tmpDate = Dateserial(holidayYear, 11, 11)
 holidays(15).Date = tmpDate
 '===================================

 '===================================
 holidays(16).Name = "Thanksgiving"
 '4th Thursday in November - this means it can
 fall anywhere between
Nov. 22 and Nov. 28
 tmpDate = Dateserial(holidayYear, 11, 22)
 wkDay = Weekday(tmpDate)
 holidays(16).Date = tmpDate - wkDay + 5 
'Subtract the current day, add
5 for Thursday
 If wkDay > 5 Then
  holidays(16).Date = holidays(16).Date + 7 
'Add 7 to go to next
week
 End If
 '===================================

 '===================================
 holidays(17).Name = "Christmas Day"
 'December 25 - Always
 tmpDate = Dateserial(holidayYear, 12, 25)
 holidays(17).Date = tmpDate
 '===================================

 Forall h In holidays
  tmpString = tmpString & Chr(13) & 
Format(h.Date, "yyyy.mm.dd")
& Chr(9) & h.Name
 End Forall

 Msgbox Mid$(tmpString, 2), , "USA Holidays for " 
& Cstr(holidayYear)

 Goto endFunc

errHandler:
 Msgbox "Invalid year entered"
 Resume endFunc

endFunc:
End Sub

Function dateEaster(y As Integer) As Variant

'See http://aa.usno.navy.mil/faq/docs/easter.html

 Dim c As Integer
 Dim n As Integer
 Dim k As Integer
 Dim i As Integer
 Dim j As Integer
 Dim l As Integer
 Dim m As Integer
 Dim d As Integer

c = y \ 100
n = y - 19 * ( y \ 19 )
k = ( c - 17 )  25
i = c - c \ 4 - ( c - k ) \ 3 +
 19 * n + 15
i = i - 30 * ( i \ 30 )
i = i - ( i \ 28 ) * ( 1 - ( i \ 28 ) 
* ( 29 \ ( i + 1 ) ) * 
( ( 21 - n ) \ 11 ) )
j = y + y  4 + i + 2 - c + c \ 4
j = j - 7 * ( j \ 7 )
l = i - j
m = 3 + ( l + 40 ) \ 44
d = l + 28 - 31 * ( m \ 4 )



 dateEaster = Dateserial(y, m, d)

End Function

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