It's all in the timing (Challenge by numbers)
December 21st, 2012. About teatime.
They couldn’t say they hadn’t been warned, but just in case, a clarion trumpet call resounded across the world; a pure clean tone, that even the deaf heard. The skies darkened as the Sun blackened, and the moon turned a lurid blood red.
And then a deep voice spoke from the skies:
HARK , MORTALS, FOR THE DAY OF JUDGEMENT IS UPON YOU . PREPARE YOURSELVES FOR -
“Er, excuse me?” came a lone voice from below.
WHAT ? came the terse reply.
“Well, is this the end of the world as predicted by the Mayans?”
INDEED . THE END OF THE 13TH B ’AK’TUN CYCLE .
“Right. Only,” the small voice continued, hesitantly, “which calendar are you going by?”
“The proleptic Gregorian calendar?” the voice persisted, “Really, you should be using a GMT -correlation based on a JDN of 54285. Which would make it the 23rd, not the 21st.”
There was a momentary pause, before the skies started to lighten.
I’LL SEE YOU IN A COUPLE OF DAYS , said the voice in the Heavens, a touch grumpily.