title: Generate a list of string csv names with 15 minutes time interval and today date
body: <p>I am trying to find a way to create a list of csv names with today's date and every 15 minutes interval (0000, 0015, 0030, 0045, 0100, 0115, .... ).</p>
  <p>I think I can get today date through <code>Sys.Date()</code> but how do I get the every 15 minutes interval?</p>
  <pre><code>data_20210827000000.csv
  data_20210827001500.csv
  data_20210827003000.csv
  ...
  data_20210827234500.csv
  </code></pre>