According to Prof. Einstein and co, there is no universal moment of 'now' and no two events separated by even a tiny amount of space can be considered to have occurred simultaneously.

Seriously, this idea would be way too dependant on very accurately synchronised clocks and unworkable because, even if we expressed the exact time down to every of the nine billion odd oscillations of caesium 133 atoms that occur every second, there is still a risk that two transactions will happen at the same apparent moment.