Adding date Information to the registry and retrieving it

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C#

DateTime

licensing

namespace Thermocoders_Licensing_System
{
  class TrialTimeManager
  {
     private string temp = "";

      public TrialTimeManager() { }

  public void SetNewDate()
  {
    DateTime newDate = DateTime.Now.AddDays(31);
    temp = newDate.ToLongDateString();
    StoreDate(temp);
  }

public void Expired()
{
    string d = "";
    using (Microsoft.Win32.RegistryKey key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\MyApp"))
    {
        d = (String)key.GetValue("Date");
    }
    DateTime now = DateTime.Parse(d);
    int day = (now.Subtract(DateTime.Now)).Days;
    if (day > 30) { }
    else if (0 < day && day <= 30)
    {
        string daysLeft = string.Format("{0} days more to expire", now.Subtract(DateTime.Now).Days);
        MessageBox.Show(daysLeft);

    }
    else if (day <= 0)
    {
        MessageBox.Show("Trial Expired Please Purchase The Product");
    }
}

public void StoreDate(string value)
{
    try
    {
        using (Microsoft.Win32.RegistryKey key = Microsoft.Win32.Registry.LocalMachine.CreateSubKey(@"SOFTWARE\MyApp"))
        {
            key.SetValue("Date", value, Microsoft.Win32.RegistryValueKind.String);
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }

}

}

}

Hi Everyone,

I found the above code from code project.It was working fine but there was an issue while storing and retrieving date information from the registry.For eg If I run the application say on 1st May 2014,the expiration date is correctly set to 1st june 2014.

The above code was working fine and it properly displayed the date when I changed my system time say If I change the date to 2nd may 2014 ,it would display 29days remaining.Now what is happening is that whenever I set the date say from 1st may 2014 to 1st june 2014, instead of throwing an error saying "Trial Period has expired" , it keeps saying 30 days remaining

And when I set the date from 1st may to 1st june,The date stored in the registry keeps changing and it sets the expiration date 30days ahead of the current date which should not be happening. What could be the error?

Can Anyone help me fix this?

Thanks