title: Get valid UTC time c++
body: <p>What is the best way to obtain the most accurate UTC time on windows in C++?</p>
  
  <p>I am collecting samples which contains UTC time stamp and I need to validate if the sample is not older than one hour. I am using the system time, but what if someone modify it manually? Should I use some web service instead? If so, which would you recommend?</p>