' Passare la data in formato gg-MM-aaaa.
Public Sub isFestivo(Data As String, Roma As Boolean) As Boolean
   Dim Festivo As Boolean
   Dim PrevDateFormat As String = DateTime.DateFormat
   DateTime.DateFormat = "dd-MM-yyyy"
   Dim GiornoData, MeseData, AnnoData As Int
   Dim DataTicks As Long
   DataTicks = DateTime.DateParse(Data)
   AnnoData = DateTime.GetYear(DataTicks)
   GiornoData = DateTime.GetDayOfMonth(DataTicks)
   MeseData = DateTime.GetMonth(DataTicks)
 
   Dim Domenica As Boolean
   Domenica = (DateTime.GetDayOfWeek(DataTicks) = 1)
 
   Dim DataPasqua As String
   Dim GiornoPasqua, MesePasqua As Int
   Dim PasquaTicks As Long
   DateTime.DateFormat = "MM-dd-yyyy"
   DataPasqua = GetEasterSunday(AnnoData, "")
   PasquaTicks = DateTime.DateParse(DataPasqua)
   GiornoPasqua = DateTime.GetDayOfMonth(PasquaTicks)
   MesePasqua = DateTime.GetMonth(PasquaTicks)
 
   Dim lstFestivi As List
   lstFestivi.Initialize
   Dim GiornoMesePasqua As String
   GiornoMesePasqua = GiornoPasqua & "-" & MesePasqua
   GiornoMeseFestaRoma As String = ""
   If Roma then
        GiornoMeseFestaRoma = "29-6"
   End If
   lstFestivi.AddAll(Array As String("1-1", "6-1", "25-04", "1-5", "2-6", "15-8", "1-11", "8-12", "25-12", "26-12", GiornoMesePasqua, GiornoMeseFestaRoma))
 
   Dim GiornoMeseData As String
   GiornoMeseData = GiornoData & "-" & MeseData
   Festivo = (lstFestivi.IndexOf(GiornoMeseData) > - 1) Or Domenica
   DateTime.DateFormat = PrevDateFormat
   Return Festivo
End Sub