time_t 时代，而不是毫秒。
如果你不关心毫秒，你应该能够这样做：

time_t is usually seconds since "the epoch", rather than milliseconds. If you dont care about milliseconds you should be able to do this:

std::time_t tt = static_cast<time_t>(ticksFromEpoch/1000)

如果您关心毫秒，您可以将它们添加回结束（对于像12：00：00.001 AM这样的时间来说很麻烦）

If you do care about milliseconds you can either add them back in at the end (which is tricky to get right for times like 12:00:00.001 AM )

或者你需要走另一条路线。您可能需要使用这样的：（未测试）

Or you'll need to go another route. You may need to use something like this: (untested)

boost::posix_time::ptime t2(
  date(1970,Jan,1),  //The epoch
  boost::posix_time::seconds( ticksFromEpoch / 1000 ) + // Number of seconds
  boost::posix_time::microseconds( ticksFromEpoch % 1000)  // And the micros too.
  );