I posted this in the developer forum an awfully long time ago, but I don't think anyone reads that any more.
On the Times & Dates page, it says:
"All that you need after that is the start of the current calendar, which occurred at Unix timestamp 1238562000, better known as 5am UTC on April 4th, 2009 (midnight Eastern Standard Time)."
Actually, 1238562000 is better known as 5am UTC on April 1st, 2009.