C Sharp :: Compare Date In Registry With Local Time?

The first time my application opens up, it should get the local date out of the System and store this in a registry key. But the second time it should get the date stored in that registryKey and compare it to the date right now.And there is where I am stuck, I just don't know how to get the date out of that key and compare it to the date right now.

This is my code:

RegistryKey key1;  
        private void btnTrial_Click(object sender, EventArgs e) {
            DateTime current = DateTime.Now;  
            key1 = Registry.CurrentUser.OpenSubKey("myKey");    
            if (key1 == null)

[code]....

at the last "if" statement it should compare the date stored in the key with the DateTime.Now.