关于软件的过期..

问题描述

我正在vb.net中开发一个软件。然后我想部署给客户。但他还没准备好支付那个软件。他先告诉我他想要一个小道版。我很努力地把他作为一条小道。我想过期日期..如何设置过期日期..？

我知道只使用系统时间给出过期日期。在这种情况下，他有机会改变系统时间和重用..我如何给15天过期日期..

任何让我知道如何计算安装时间到15天之间的天数...

I am developing a software in vb.net . Then I want to deployment to a customer. but he don't ready to give the payment of that software. he told me first he want a trail version. I am reedy to give him as a trail. I want to an expire date.. How to set that Expire date..?
I know only to give expire date using system time.. In that case he has a chance to change the System time and reuse.. How can I give 15 days Expire date..
any give me any idea about how to calculate days between Installed time to 15 days count..

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