title: dplyr filter by multiple conditions including date
body: <p>My dataset:</p>
  <pre><code>&gt; as_tibble(wq4)
  # A tibble: 58,538 x 4
     Date       Site  Analyte                    Value2
     &lt;date&gt;     &lt;fct&gt; &lt;fct&gt;                       &lt;dbl&gt;
   1 2014-01-10  N2   Ammonia NH3-N               0.01 
   2 2014-01-10  N2   Chlorophyll - a             1.5  
   3 2014-01-10  N2   Filtered Total Phosphorus   0.005
   4 2014-01-10  N2   Oxidised Nitrogen           0.1  
   5 2014-01-10  N2   Total Nitrogen              0.3  
   6 2014-01-10  N2   Total Phosphorus            0.008
   7 2014-01-10  N2   Ammonia NH3-N               0.02 
   8 2014-01-10  N2   Chlorophyll - a             1.4  
   9 2014-01-10  N2   Conductivity                191    
  10 2014-01-10  N2   Enterococci                 19    
  # … with 58,528 more rows
  </code></pre>
  <p>I want to filter out a certain set of values based on multiple conditions using dplyr. What I've got so far is:</p>
  <pre><code>filter(wq4, Site != &quot;N1&quot; &amp; !Date %in% c(&quot;2019-04-17&quot;, &quot;2019-04-18&quot;, &quot;2019-04-19&quot;))
  </code></pre>
  <p>I essentially want to remove any data from the 17th to 19th Apr 2019, only at Site N1 (not any of my other sites).</p>
  <p>I don't think this line of code is working for me. It is either the &quot;&amp;&quot; or perhaps dplyr is struggling with the date format?</p>
  <p>Any suggestions?
  Thanks.</p>