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I am making a Gym management system in windows form ( .Net ) . In this I check a user last pay fee date with current System date when application is start if current date is 30 days greater than last fee pay date then user will be able to pay fee .. but my problem is this if user change a system date than my logic is failed what I do please suggest me ?? (sorry for my bad English)
If this is for operators who are working for the gym, tell them not to mess up machines they are meant to be keeping in a reasonable state to work with.
If this is for users themselves don’t give them an application that let’s them deal with this sort of thing, use a client-server approach, and go by the server’s date. And for that matter, why an executable rather than just a web-page?