计算两天之间相差天数最简单的代码

//Rata Die day one is 0001-01-01 int calculateDays(uint32_t year, uint32_t month, uint32_t day) { if (month < 3) year--, month += 12; return 365 * year + year / 4 - year / 100 + year / 400 + (153 * month - 457) / 5 + day - 306; } int diffDays=calculateDays(2019, 8, 1) - calculateDays(1970, 1, 1); std::cout<<diffDays<<std::endl;