At 11:12 UTC, 6:12 EST, 3:12 PST.
Fri 2012-12-21 11:12:00 +0000
Fri 2012-12-21 06:12:00 -0500
Fri 2012-12-21 03:12:00 -0800
In the picture, the sun makes it lowest trek across the sky on the winter solstice. Winter officially begins.
Image credit: From NASA/NES Teachers Corner