C++获取当前时间

通过gettimeofday获取

#include <sys/time.h>

static int64_t GetCurrentMilliseconds() {
  timeval now;
  gettimeofday(&now, NULL);
  return now.tv_sec * (int64_t)1000 + now.tv_usec / (int64_t)1000;
}

static int64_t GetCurrentMicroseconds() {
  timeval now;
  gettimeofday(&now, NULL);
  return now.tv_sec * (int64_t)1000000 + now.tv_usec;
}

通过std::chrono库获取

int64_t TimeUtils::GetCurrentMilliSeconds() {
  auto current_time = std::chrono::system_clock::now().time_since_epoch();
  return std::chrono::duration_cast<std::chrono::milliseconds>(current_time).count();
}

int64_t TimeUtils::GetCurrentMicroseconds() {
  auto current_time = std::chrono::system_clock::now().time_since_epoch();
  return std::chrono::duration_cast<std::chrono::microseconds>(current_time).count();
}

std::string TimeUtils::ToDateString(int64_t timestamp_ms) {
  std::time_t timestamp = timestamp_ms;
  std::stringstream string_stream;
  string_stream << std::put_time(std::localtime(&timestamp), "%Y-%m-%d");
  return string_stream.str();
}

std::string TimeUtils::ToDatetimeString(int64_t timestamp_ms) {
  std::time_t timestamp = timestamp_ms;
  std::stringstream string_stream;
  string_stream << std::put_time(std::localtime(&timestamp), "%Y-%m-%d %H:%M:%S");
  return string_stream.str();
}