def nyse_add_and_substract(self): ans = DateUtils.nyse_add(datetime(2009, 4, 13), 5) self.assertEquals(ans, datetime(2009, 4, 20)) ans = DateUtils.nyse_substract(datetime(2009, 4, 13), 5) self.assertEquals(ans, datetime(2009, 4, 3)) ans = DateUtils.nyse_add(datetime(1990, 10, 1), 7) self.assertEquals(ans, datetime(1990, 10, 10)) ans = DateUtils.nyse_substract(datetime(1990, 10, 1), 3) self.assertEquals(ans, datetime(1990, 9, 26))