*/ function periodCodes(): array { return [ ['1D', 'D', 1, 1.0], ['7D', 'D', 7, 7.0], ['2W', 'W', 2, 15.0], // (2/4) * 30 = 15 days ['1M', 'M', 1, 30.0], ['3M', 'M', 3, 90.0], ['1Y', 'Y', 1, 360.0], // 12 * 30 = 360 days ['2Y', 'Y', 2, 720.0], // 24 * 30 = 720 days ]; }