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'计算两个日期之间相差的天数，并为该天数构造一个 TimeSpan 值
Dim oldDate As Date = $dateLiteral$
Dim newDate As Date = $dateLiteral2$
Dim differenceInDays As Long = DateDiff(DateInterval.Day, oldDate, newDate)
Dim spanFromDays As TimeSpan = New TimeSpan(CInt(differenceInDays), 0, 0, 0)
'计算同一天中两个时间之间相差的秒数，并为该秒数构造一个 TimeSpan 值
Dim oldTime As Date = $timeValue$
Dim newTime As Date = $timeValue2$
' You can also determine the difference in times in other units.
Dim differenceInSeconds As Long = DateDiff(DateInterval.Second, oldTime, newTime)
Dim spanFromSeconds As TimeSpan = New TimeSpan(0, 0, CInt(differenceInSeconds))

'计算指定角度的余弦值(将角度转换成弧度，然后计算余弦值)
Dim radians As Double = $Degrees$ * Math.PI / 180
Dim cos As Double = Math.Cos(radians)
'计算指定角度的正切值
Dim radians As Double = $Degrees$ * Math.PI / 180
Dim tan As Double = Math.Tan(radians)
'计算指定角度的正弦值
Dim radians As Double = $Degrees$ * Math.PI / 180
Dim sin As Double = Math.Sin(radians)

'判断是否是素数
Function X(ByVal val As Integer) As Boolean
    Dim flag As Boolean
    Dim n, k, i, swit As Integer
    n = val
    k = Int(Math.Sqrt(n))
    i = 2
    swit = 0
    While i <= k And swit = 0
        If n Mod i = 0 Then
            swit = 1
        Else : i += 1
        End If
    End While
    If swit = 0 Then
        flag = True '是素数
    Else
        flag = False
    End If
    Return flag
End Function

’身份证判断年龄
Function Sfz(ByVal A As String, ByVal B As String) '判断年龄的过程
  If A.Length = 18 Then
      A = A.Substring(6, 4) & "-" & A.Substring(10, 2) & "-" & A.Substring(12, 2)
      B = DateDiff("yyyy", CDate(A), Now.Date)
  ElseIf A.Length = 15 Then
      A = "19" & A.Substring(6, 2) & "-" & A.Substring(8, 2) & "-" & A.Substring(10, 2)
      B = DateDiff("yyyy", CDate(A), Now.Date)
  ElseIf A.Length = 0 Then
      MsgBox("身份证号码不能为空,请填写。", MsgBoxStyle.Information + MsgBoxStyle.OkOnly, "提示")
      B = Nothing
  Else
      MsgBox("该身份证不符合要求")
  End If
  Return B
End Function