time that does not depend in system time
<p>I am developing a game in C++ for iPhone. I need to give hourly bonus to the player. I implemented this using time(NULL) method to check for next. But that can cheated easily by changing the device time. So what alternative I have to prevent this?</p>

<p>I of my friend told me to sync that to my server. But that is not an option as no server communication is there at present. Please help...</p>

<p>Thanks in advance!!!</p>
