Here's a countdown clock.
It's supposed to end on 11:11 GMT. I don't know if that's AM or PM though.
Oh, and here's a countdown thread.
However, the archeologists say that these the newly discovered tables — which pre-date the oldest known codex by as much as 500 years — span over 7,000 years of time, stretching far beyond of present age. So, you can breathe a little easier, though the news will come as a big shock to the tourism industry in Belize and other "entreprenuers" who are willing to take all your money off your hands before the big one hits.
Greenwich Mean Time (GMT) is a time system originally referring to mean solar time at the Royal Observatory in Greenwich, London, which later became adopted as a global time standard.