Rally Poland will now take place on September 13-15, with Rally Croatia moving from June to September 26-28, when the Polish race was originally scheduled to run.
Barum Czech Rally Zlin, which concludes on September 1, begins the dramatic month.
The changes were made at the request of the Croatian motorsport federation, which wished its event to coincide with the country hosting a meeting of the FIA’s World Motor Sport Council, and approved by a fax vote among WMSC members.
François Ribeiro, motorsport development director at promoter Eurosport Events, said: “Changing the calendar once the season is underway is never an ideal situation but we must thank the organisers of Rally Poland for their assistance in accommodating a request by the Croatia Rally.
"Even though we have now a gravel event in between two tarmac rallies, the momentum will be high and the ERC will firmly be in the public eye during the month of September.
“While the date of Rally Poland now clashes with the WRC round in Australia, something we had looked to avoid with the FIA, the different time zones and the fact the two rallies appeal to a different competitor base means neither rally should be overly affected."
01 International Jännerrallye (Austria), Asphalt/snow, 3-5 January
02 Rally Liepāja-Ventspils (Latvia), Gravel/snow, 1-3 February
03 Rally Islas Canarias El Corte Inglés (Spain), Asphalt, 21-23 March
04 SATA Rallye Açores (Portugal), Gravel, 25-27 April
05 Tour de Corse (France), Asphalt, 16-18 May
06 GEKO Ypres Rally (Belgium), Asphalt, 27-29 June
07 Rally San Marino*, Gravel, 11-13 July
08 Sibiu Rally (Romania), Gravel, 25-27 July
09 Barum Czech Rally Zlín, Asphalt, 30 August-1 September
10 Rally Poland, Gravel, 13-15 September
11 Croatia Rally, Asphalt, 26-28 September
12 Rallye Sanremo (Italy), Asphalt, 10-12 October
13 Rallye International du Valais (Switzerland), Asphalt, 7-9 November