title: VBA - check if some time period is contained entirely in some month
body: <p>I have information about some time periods given as start and end weeks (defined as ISO weeks, so they may start not only on Monday).</p>
  
  <p>Regarding ISO definition, a month may contain 4 or 5 weeks <a href="http://en.wikipedia.org/wiki/ISO_week_date#Weeks_per_month" rel="nofollow">description on wikip</a>.
  I want to check if some time periods are entirely contained in some months and after it execute next commands.</p>
  
  <p>How can I do this in Excel VBA? Are there any special functions which can help me to achieve the mentioned check?</p>