title: lack of data in time series 10 minuets data
body: <p>I have a time series dataframe for forecasting in python that records data every 10 minutes. But unfortunately, it missed some data in between, so I have two main questions:</p>
  <ol>
  <li>My first question is how can I fill this gap which wouldn't change other data.</li>
  <li>My second question is how can I change the time like 10:12:46 (with H: M:S format) to 10:10:00(or Does this correct to change the time format)</li>
  </ol>