The point at which time since the epoch reaches 1234567890 is momentous historical occasion happening today and I don’t want to let it slip past unnoticed, and now you don’t have to either! Just run:
watch -n1 echo 'Time since epoch: `date +"%s"`s'
in a terminal and bathe in the magnitude of the moment. It should work on Linux and Mac, Windows users will have to have a little cry instead or something.