Logically, that's what I figured too.  its 3 dark nights, so the start could be at any point.  The post at 9:30 (local to me) on the 22nd seems more like the start than the 21... That would put the Jan 1 as the end of the darkness, so, the second would be the bringing things to light. Frankly, not gonna lose hope over a rounding error in interpretation one way or the other.  But, seems that the day after the house swears in would be the best day, not expected and would throw all sorts of plans in loops...