The academic calendar of the EC2/BIG-NSE is identical to those of its four supporting universities (FU, HU, TU, UP):

Winter semester: usually from October 1 to March 31
lectures: from mid-October to mid-February
Summer semester: usually from April 1 to September 30
lectures: from mid-April to mid-July
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The application period for the winter semester ends in mid-January in case of the scholarship applications and at the end of August for associated members (details here).