datestr，nsdata转nsstring

1 小时转换为分钟/秒/毫秒/微秒 #include <iostream>#include <string>#include <chrono>int main(){std::chrono::hours hour_time = std::chrono::hours(1);std::chrono::minutes minutes_time = std::chrono::duration_cast<std::chrono::minutes>(hour_time);std::chrono::seconds seconds_time = std::chrono::duration_cast<std::chrono::seconds>(hour_time);std::chrono::milliseconds milliseconds_time = std::chrono::duration_cast<std::chrono::milliseconds>(hour_time);std::chrono::microseconds microseconds_time = std::chrono::duration_cast<std::chrono::microseconds>(hour_time);std::cout << "1小时可转换为 \n"<< minutes_time.count() << "分钟 \n"<< seconds_time.count() << "秒 \n"<< milliseconds_time.count() << "毫秒 \n"<< microseconds_time.count() << "微秒" << std::endl;getchar();return 0;} 2 分钟转换为小时/秒/毫秒/微秒 #include <iostream>#include <string>#include <chrono>int main(){std::chrono::minutes minutes_time = std::chrono::minutes(66);std::chrono::hours hours_time = std::chrono::duration_cast<std::chrono::hours>(minutes_time);std::chrono::seconds seconds_time = std::chrono::duration_cast<std::chrono::seconds>(minutes_time);std::chrono::milliseconds milliseconds_time = std::chrono::duration_cast<std::chrono::milliseconds>(minutes_time);std::chrono::microseconds microseconds_time = std::chrono::duration_cast<std::chrono::microseconds>(minutes_time);std::cout << "分钟可转换为 \n"<< hours_time.count() << "小时 \n"<< seconds_time.count() << "秒 \n"<< milliseconds_time.count() << "毫秒 \n"<< microseconds_time.count() << "微秒" << std::endl;getchar();return 0;} 3 秒转换为小时/分钟/毫秒/微秒 #include <iostream>#include <string>#include <chrono>int main(){std::chrono::seconds seconds_time = std::chrono::seconds(36000);std::chrono::hours hours_time = std::chrono::duration_cast<std::chrono::hours>(seconds_time);std::chrono::minutes minutes_time = std::chrono::duration_cast<std::chrono::minutes>(seconds_time);std::chrono::milliseconds milliseconds_time = std::chrono::duration_cast<std::chrono::milliseconds>(seconds_time);std::chrono::microseconds microseconds_time = std::chrono::duration_cast<std::chrono::microseconds>(seconds_time);std::cout << "秒钟可转换为 \n"<< hours_time.count() << "小时 \n"<< minutes_time.count() << "分钟 \n"<< milliseconds_time.count() << "毫秒 \n"<< microseconds_time.count() << "微秒" << std::endl;getchar();return 0;} 4 毫秒转换为小时/分钟/秒/微秒 #include <iostream>#include <string>#include <chrono>int main(){std::chrono::milliseconds milliseconds_time = std::chrono::milliseconds(3600000);std::chrono::hours hours_time = std::chrono::duration_cast<std::chrono::hours>(milliseconds_time);std::chrono::minutes minutes_time = std::chrono::duration_cast<std::chrono::minutes>(milliseconds_time);std::chrono::seconds seconds_time = std::chrono::duration_cast<std::chrono::seconds>(milliseconds_time);std::chrono::microseconds microseconds_time = std::chrono::duration_cast<std::chrono::microseconds>(milliseconds_time);std::cout << "毫秒可转换为 \n"<< hours_time.count() << "小时 \n"<< minutes_time.count() << "分钟 \n"<< seconds_time.count() << "秒 \n"<< microseconds_time.count() << "微秒" << std::endl;getchar();return 0;} 5 微秒转换为小时/分钟/秒/毫秒 #include <iostream>#include <string>#include <chrono>int main(){std::chrono::microseconds microseconds_time = std::chrono::microseconds(3600000000);std::chrono::hours hours_time = std::chrono::duration_cast<std::chrono::hours>(microseconds_time);std::chrono::minutes minutes_time = std::chrono::duration_cast<std::chrono::minutes>(microseconds_time);std::chrono::seconds seconds_time = std::chrono::duration_cast<std::chrono::seconds>(microseconds_time);std::chrono::milliseconds milliseconds_time = std::chrono::duration_cast<std::chrono::milliseconds>(microseconds_time);std::cout << "微秒可转换为 \n"<< hours_time.count() << "小时 \n"<< minutes_time.count() << "分钟 \n"<< seconds_time.count() << "秒 \n"<< milliseconds_time.count() << "毫秒" << std::endl;getchar();return 0;} 6 自定义duration进行转换 #include <iostream> #include <chrono> typedef std::chrono::duration<float, std::ratio<3, 1> > three_seconds; typedef std::chrono::duration<float, std::ratio<1, 10> > one_tenth_seconds; int main() { three_seconds s = std::chrono::duration_cast<three_seconds>(one_tenth_seconds(3)); std::cout << "3 [1/10 seconds] equal to " << s.count() << " [3 seconds]\n"; std::cin.get(); }

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