python time since epoch hacking system variable

I am trying to figure out whether it’s safe to let a payed software check its own license date validity using the client’s computer

the way this is done is by invoking time.time() function from python and comparing it to the hashed license expiry date. if the time.time() returns anything after the expiry date than the software throws a license expired error.

The concern I have is whether it’s possible for someone to change some system variables and get time.time() function return a different difference since epoch than the real actual one.


Alternatives to CCBill or Epoch

I'm having a hard time finding an alternative for an adult payment processor company.
I've been using CCbill for a few years without problems but they're charging me 16% + 5% (security deposit that i only see back in 6 months), so 21% for any sale i make i find it almost a robbery, i just tolerate it because they're credible and trustworthy company that always pays on time and have good client support, however i'm expanding my business and expect high increase on sales in the upcoming…

Alternatives to CCBill or Epoch