Regrettably, I am miserable at math

So I was informed that I would be flying back to London on New Year's Eve, and my dismay was summarily tempered by gnawing curiosity. I wonder if this means that I will be celebrating the New Year several times over different timezones, which would indeed be Uber-Delightful, but I lack the mathematical/physics prowess to verify this. Any bright sparks out there are welcome to enlighten me!

My guest writers are ALIVE.