title: Giving a two dates (or two months) detect in what season we are in PHP
body: <p>I would like to know if there is some easy way to identify seasons: spring, summer, autumn or winter. I'm have to generate a 'resume' and I'd like that if a period of working roughly fits a season (not exactly but with a +/-10 days error for example) it returns spring, summer, autumn or winter.</p>
  
  <p>Like:</p>
  
  <ul>
  <li>input: 25/06/2010, 30/09/2010</li>
  <li>output: Summer 2010</li>
  </ul>
  
  <p>(In Spain summer is between 21 July and 20 September)</p>
  
  <ul>
  <li>input: 02/02/2009, 30/04/2010</li>
  <li>output: 2009-2010</li>
  </ul>
  
  <p>Any idea  how to do this?</p>