In Jeff 

December 20th is when they officially started the reforms by devaluing the currency. Why did Iraq devalue the currency? That was a directive and a requirement by the IMF and the World Bank to reduce the 3 zero note count in the country of Iraq so the citizens don’t get rich…It was a 90-day tool.  That’s why they started it on December 20th. Add 90 days to a Sunday and you got your rate change day.