试用版限制时间与日期的方法可用注册表简单地保存已用的天数或次数 '次数限制（如30次）：
Private Sub Form_Load()
Dim a As Long
Dim b As Long
b = GetSetting("MyApp", "set", "times", 51345)
a = b Xor 51345  
If a < 30 Then
MsgBox "现在剩下：" & 30 - a & "试用次数，好好珍惜！"
a = a + 1
b = b Xor 51345
SaveSetting "MyApp", "set", "times", b
Else
MsgBox "试用次数已满，请联系gfuuyygy!"  
End If
End Sub
'时间限制的（如10天）
Private Sub Form_Load()
Dim a As Long
a = GetSetting("MyApp", "set", "day", 0)
If a = 10 Then
MsgBox "试用期已过，请联系gfuuyygy!"
Else
MsgBox "现在剩下：" & 10 - a & "试用天数，好好珍惜！"  
if day(now)-a>0 then
a = RemainDay + 1
SaveSetting "MyApp", "set", "times", a
End if
End if
End Sub