title: How do you count cells with a certain partial string?
body: <p>I have cells with dates that are formatted in different ways (and too messy to re-format, also lots of data) but if I want to count how many dates are in October, for example, I was hoping to do a <code>COUNTIF()</code> or <code>COUNTA(FILTER())</code> but I'm not sure how to search the cell for the partial string <code>10/</code> (this is the only unique combination of characters that I can think of that would ID only the correct month).</p>