Start of the period	End of the period	Due date
January	2011-02-01	2012-01-31	2012-04-30
February	2011-03-01	2012-02-29	2012-05-31
March	2011-04-01	2012-03-31	2012-07-03
April	2011-05-01	2012-04-30	2012-07-31
May	2011-06-01	2012-05-31	2012-08-31
June	2011-07-01	2012-06-30	2012-10-01
July	2011-08-01	2012-07-31	2012-10-31
August	2011-09-01	2012-08-31	2012-11-30
September	2011-10-01	2012-09-30	2013-01-03
October	2011-11-01	2012-10-31	2013-01-31
November	2011-12-01	2012-11-30	2013-02-28
December	2012-01-01	2012-12-31	2013-04-02