http://www.dw-world.de/dw/article/0,1564,1690713,00.html :

“An early general election in Germany will take place on Sept. 18 after the country's constitutional court judges on Thursday threw out complaints challenging the constitutionality of an early poll.

Germany's highest court on Thursday gave the go-ahead for an early general election, removing the final hurdle to the September 18 poll….”