# Step 1.5: Checking the expiration date of the serial number

Now put a new line to the ini-file in the following format: ExpDate=YYYYMMDD. For example:

    ExpDate=20000101

The date specified in this line must be already passed, that is, the maximum date is yesterday. When we run the program, we should see the following:

    state = SERIAL_STATE_FLAG_DATE_EXPIRED
    please register!

Now let's get some more information before the "please register" message is shown and the program exists:

    if (res)
    {
            VMProtectSerialNumberData sd = {0};
            VMProtectGetSerialNumberData(&sd, sizeof(sd));
            printf("exp. date: y = %d, m = %d, d = %d\n", sd.dtExpire.wYear, sd.dtExpire.bMonth, sd.dtExpire.bDay);
            printf("please register!\n");
            return 0;
    }

The second run of the app now provides more details to us:

    state = SERIAL_STATE_FLAG_DATE_EXPIRED
    exp. date: y = 2000, m = 1, d = 1
    please register!

Ok, now remove the ExpDate=... line from the ini-file, so it will not influence everything else we are to do.

Next step

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