Battle.net Account Expiration Code

// This is how classic Battle.net calculates if your account is expired or not.
// Pretend that the functions that this function calls actually return real data about that account.
// You could do this in a multitude of ways, such as providing the necessary data in the function parameters instead.
// The end result is the same -- see the return line.

void isExpired(int databaseId)
{
  FILETIME today = getToday();                             // today's date and time in a FILETIME struct
  FILETIME accountCreated = getAccountCreated(databaseId); // profile key: System/Account Created
  FILETIME lastLogon = getLastLogon(databaseId);           // profile key: System/Last Logon
  int timeLogged = getTimeLogged(datebaseId);              // profile key: System/Time Logged

  // Note that the FILETIME structure is based on 100-nanosecond intervals.
  int oneSecond   = (10000000);
  int twoHours    = (oneSecond * 60 * 60 * 2);
  int twoDays     = (oneSecond * 60 * 60 * 24 * 2);
  int threeMonths = (oneSecond * 60 * 60 * 24 * 90);

  // Note that I am not paying attention whether I can add int to FILETIME, that is up to how you code this yourself.
  // This is only a concept demonstration of how the code could look like.

  return (accountCreated + twoHours < today && (timeLogged < twoDays || lastLogon + threeMonths < today));
}