title: Remove time part from a DateTime
body: <p>I have a bunch of data in a Google Spreadsheet and I have a column of Date's that are formatted like this: </p>
  
  <blockquote>
    <p>2017-04-09T08:38:15Z</p>
  </blockquote>
  
  <p>I want to remove everything after the date so in this case it will leave the following:</p>
  
  <blockquote>
    <p>2017-04-09</p>
  </blockquote>
  
  <p>I want to use a the "Search using regular expressions" feature for "Find and Replace..." in Google Sheets to do this, can anyone please help me with such a regular expression that is able to be used as a simple search and replace?</p>