Digitally, time in terms of "seconds past Jan 1, 1970, GMT". (Dates preceding the Epoch are negative numbers.) Sometimes just called "Unix time"..
Anyhow today the clock will run past 1234567890. For me at GMT-7 that will be 4:31pm, for folks in BC that's 3:31.
So: Happy 1234567890 day everyone!
Yes, I really do pay attention to these sorts of things.