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  1. #include <chrono>
  2. #include <iostream>
  3. #include <ctime>
  4.  
  5. std::chrono::system_clock::duration duration_since_midnight() {
  6.     auto now = std::chrono::system_clock::now();
  7.  
  8.     time_t tnow = std::chrono::system_clock::to_time_t(now);
  9.     tm *date = std::localtime(&tnow);
  10.     date->tm_hour = 0;
  11.     date->tm_min = 0;
  12.     date->tm_sec = 0;
  13.     auto midnight = std::chrono::system_clock::from_time_t(std::mktime(date));
  14.  
  15.     return now-midnight;
  16. }
  17.  
  18. int main()
  19. {
  20.     auto since_midnight = duration_since_midnight();
  21.  
  22.     auto hours = std::chrono::duration_cast<std::chrono::hours>(since_midnight);
  23.     auto minutes = std::chrono::duration_cast<std::chrono::minutes>(since_midnight - hours);
  24.     auto seconds = std::chrono::duration_cast<std::chrono::seconds>(since_midnight - hours - minutes);
  25.     auto milliseconds = std::chrono::duration_cast<std::chrono::milliseconds>(since_midnight - hours - minutes - seconds);
  26.     auto microseconds = std::chrono::duration_cast<std::chrono::microseconds>(since_midnight - hours - minutes - seconds - milliseconds);
  27.     auto nanoseconds = std::chrono::duration_cast<std::chrono::nanoseconds>(since_midnight - hours - minutes - seconds - milliseconds - microseconds);
  28.  
  29.     std::cout << hours.count() << "h ";
  30.     std::cout << minutes.count() << "m ";
  31.     std::cout << seconds.count() << "s ";
  32.     std::cout << milliseconds.count() << "ms ";
  33.     std::cout << microseconds.count() << "us ";
  34.     std::cout << nanoseconds.count() << "ns\n";
  35. }
Success #stdin #stdout 0s 3016KB
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8h 50m 49s 639ms 713us 0ns
https://ideone.com/vBt6D
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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