#include <chrono>
#include <ctime>
using namespace std::chrono;

system_clock::time_point time_point_now = system_clock::now(); // 获取当前时间点
system_clock::duration duration_since_epoch 
        = time_point_now.time_since_epoch(); // 从1970-01-01 00:00:00到当前时间点的时长
time_t microseconds_since_epoch 
        = duration_cast<microseconds>(duration_since_epoch).count(); // 将时长转换为微秒数
time_t seconds_since_epoch = microseconds_since_epoch / 1000000; // 将时长转换为秒数
std::tm current_time = *std::localtime(&seconds_since_epoch); // 获取当前时间(精确到秒)
time_t tm_microsec = microseconds_since_epoch % 1000; // 当前时间的微妙数
time_t tm_millisec = microseconds_since_epoch / 1000 % 1000; // 当前时间的毫秒数
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