Computers have indeed changed beyond recognition, but the Unix time beneath them is still there. If you’re running any flavor of Linux device or a Mac, it is there in the lower half of the operating system, right below the GUI. If you have a Mac within reach, open up the app Terminal, which is the gateway to how your computer actually works. Type in date +%s and hit Enter. Staring you in the face will be the number of seconds that have passed since January 1, 1970.