In a wonderful example of the social construction of time, there was no Friday, December 30th, 2011 in Samoa (NPR).
The country decided to move from one side of the International Dateline to the other. The move, accomplished by skipping forward 24 hours, will allow it to align its week with its largest trading partners: Australia, New Zealand, China and Tonga. Many business leaders were thrilled at the switch.
Thanks to sociologist Dan Hirschman for the tip! Also in the social construction of time: Social Construction, Deviance, and Daylight Savings.