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"From late 2002, the market began to standardise credit default swap contracts so that they would all mature on one of four days each year – 20 March, 20 June, 20 September and 20 December. So, for example, a ‘five-year’ contract traded any time between 21 September 2005 and 20 December 2005 would have a termination date of 20 December 2010.
Premiums for credit default swaps are usually paid quarterly on these same dates, which are often called IMM dates by analogy with the International Monetary Market date used in the euromoney market. (However, it should be noted that the true IMM dates are the third Wednesday of March, June, September and December.)"