Using today's Gregorian calendar, we would say that Johann Sebastian Bach was born on March 31, 1685 in Eisenach, Saxe-Eisenach. However, it is very common to commemorate JSB's birthdate as March 21, 1685, the day of his birth in the Julian Calendar, the system in effect in central Germany in 1685. I say: let's use both days to remember and enjoy the life and work of this most amazing composer and musician. Happy Birthday, Bach!