How to restrict the user to enter only valid time in WinForms MaskedEditBox?

private void maskedEditBox1_MaskCustomValidate(object sender,
Syncfusion.Windows.Forms.Tools.MaskCustomValidateArgs e)
{
    currentText.Remove(0, this.currentText.Length);
    currentText.Append(this.maskedEditBox1.Text);
    if (e.CurrentIndex ==0)
    {
        currentText[e.CurrentIndex] = e.CurrentCharacter;
        if (e.CurrentCharacter <= '0' || e.CurrentCharacter > '2')
        {
            e.Handled = true;
            e.Accepted = false;
        }
    }
    else if (e.CurrentIndex ==1)
    {
        currentText[e.CurrentIndex] = e.CurrentCharacter;
        if (currentText[0] > '1')
        {
            if (e.CurrentCharacter >= '5')
            {
                e.Handled = true;
                e.Accepted = false;
            }
        }
    }
    else if (e.CurrentIndex ==3)
    {
        currentText[e.CurrentIndex] = e.CurrentCharacter;
        if (e.CurrentCharacter > '5')
        {
            e.Handled = true;
            e.Accepted = false;
        }
    }
    else if (e.CurrentIndex == 4)
    {
       currentText[e.CurrentIndex] = e.CurrentCharacter;
    }
}

Private Sub maskedEditBox1_MaskCustomValidate(ByVal sender As Object, ByVal e As
Syncfusion.Windows.Forms.Tools.MaskCustomValidateArgs) Handles
maskedEditBox1.MaskCustomValidate
    currentText.Remove(0, Me.currentText.Length)
    currentText.Append(Me.maskedEditBox1.Text)
    If e.CurrentIndex =0 Then
       currentText(e.CurrentIndex) = e.CurrentCharacter
       If e.CurrentCharacter <= "0"c OrElse e.CurrentCharacter > "2"c Then
          e.Handled = True
          e.Accepted = False
       End If
    EndIf
    ElseIf e.CurrentIndex =1 Then
       currentText(e.CurrentIndex) = e.CurrentCharacter
       If currentText(0) > "1"c Then
          If e.CurrentCharacter >= "5"c Then
             e.Handled = True
             e.Accepted = False
          End If
       End If
    EndIf
    ElseIf e.CurrentIndex =3 Then
       currentText(e.CurrentIndex) = e.CurrentCharacter
       If e.CurrentCharacter > "5"c Then
          e.Handled = True
          e.Accepted = False
       End If
    EndIf
    ElseIf e.CurrentIndex = 4 Then
       currentText(e.CurrentIndex) = e.CurrentCharacter
    End If
End Sub