Vernal Equinox has taken place on March 20th 2012 at 05:14 GMT (-5 hours for eastern USA) which would have made it occur at 14 minutes past midnight of 3/19. If you hunt around the web, there is a complete timezone chart. I just don't remember where. Perhaps this will inspire another good deed doer into action and add some facts
Vernal Equinox (spring) will occur on March 20th 2012 at 05:14 GMT. In the Northern Hemisphere the Vernal Equinox occurs around March 21st and in the Southern Hemisphere the respective date is reversed.