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DateDiff - << VERSIONE C# >>
Una classe DateDiff per calcolare l'intervallo tra due date
La classe DateDiff
Imports System
Namespace myApps
Public Class DateDiff
Public Sub DateDiff()
'costruttore di default
End Sub
Public Enum howToCompare
m = 1
s
t
mm
yyyy
q
d
End Enum
Public Shared Function GetDiff(ByVal mode As howToCompare, ByVal startDate As System.DateTime, ByVal endDate As System.DateTime) As Double
Dim diff As Double = 0
Try
Dim ts As System.TimeSpan = New System.TimeSpan(startDate.Ticks - endDate.Ticks)
Select Case (mode.ToString().ToLower())
Case "m"
diff = Convert.ToDouble(ts.TotalMinutes)
Exit Select
Case "s"
diff = Convert.ToDouble(ts.TotalSeconds)
Exit Select
Case "t"
diff = Convert.ToDouble(ts.Ticks)
Exit Select
Case "mm"
diff = Convert.ToDouble(ts.TotalMilliseconds)
Exit Select
Case "yyyy"
diff = Convert.ToDouble(ts.TotalDays / 365)
Exit Select
Case "q"
diff = Convert.ToDouble((ts.TotalDays / 365) / 4)
Exit Select
Case Else
'd
diff = Convert.ToDouble(ts.TotalDays)
Exit Select
End Select
Catch
diff = -1
End Try
Return diff
End Function
End Class
End Namespace
Un esempio di utilizzo
<%@ Page language="vb" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<script runat="server">
Private Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Dim oggi As DateTime = DateTime.Now
Dim domani As DateTime = oggi.AddDays(1)
Dim diff As Double = _
myApps.DateDiff.GetDiff(myApps.DateDiff.howToCompare.m, domani, oggi)
Response.Write(diff.ToString())
End Sub
</script>
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
</form>
</body>
</HTML>
