title: How to calculate the week number within a month, given Sun-Sat is the week
body: <p>Let's say that my week starts on Sunday and ends on Saturday.</p>
  
  <p>Given a date, I want to find it's week number in that month but also consider partial weeks into account. For ex., in this calendar, <a href="http://cityofdefiance.com/wp-content/uploads/2019-calendar-3-e1545926721248.jpg" rel="nofollow noreferrer">http://cityofdefiance.com/wp-content/uploads/2019-calendar-3-e1545926721248.jpg</a></p>
  
  <p>01-Jan-19: Week 1<br>
  06-Jan-19: Week 2<br>
  26-Jan-19: Week 4<br>
  28-Jan-19: Week 5<br></p>
  
  <p>01-Feb-19: Week 1<br>
  28-Feb-19: Week 5</p>
  
  <p>01-Jun-19: Week 1<br>
  30-Jun-19: Week 6</p>
  
  <p>Thanks!</p>