3 . 1 4 1 5 9 2 6 5 3 5 8 9 7 9 3 2 3 8 4 6
03-14-15, at 9:02:39.215387592 had a nice ring to it.
But! Greenwich standard time? Or Eastern DST?
This year, on the 03-14-2020? Meh.
Non-ironically, most people learn to use a rounded version of Pi.
The ancient Greek approximation was 22/7; the Chinese came up with 355/113 (3.1415929, accurate iow to six decimal places).