title: Calculate the starting and ending date/time from a given year and week number
body: <p>How do I calculate the starting and ending date/time (YYYY-mm-DD HH:MM::SS) for a given year and ISO week number of the year?</p>
  
  <p>I searched SO before asking this kind of question again. Surely, there were some threads concerning to the conversion from (year, weeknumber) to (datetime) on SO. But they were answered by speaking Perl, PHP, JAVA, SQL, C#, .NET, Excel, and and other programming languages except the C/C++.</p>