Dec 9, 2013
"This maintenance will occur during the following timeframe*:
- Maintenance Start: Monday, December 9th, 2013 11:00 AM PT
- Maintenance End: Monday, December 9th, 2013 4:00 PM PT
*all times are approximate and subject to change"
Give or take a few hours, it started earlier than posted. So probably around 8pm EST, is your best bet.