Can't play downloaded Netflix movies offline

Ok got it, after further experimentation it seems the Netflix app puts a time stamp on to the download,
It doesn’t need precisely the current time but any time and date after the download was done, as I tried putting in the 1st of May that gave me the same code, but the 2nd of May worked,
So knowing that perhaps the ppm can be reprogrammed to have the default time and date to say 2030 when internet isn’t available to update the time instead of January 2016, that should fool it to work right?
It will save the trouble of manually changing the time .