title: How to convert irregular datetime to total seconds in python pandas
body: <p>I have a column of duration but the values are different. Some duration are only time format and some have mixed with date. I want the duration column in total seconds. I tried to convert the column with to_datetime and parse_date methods but it cannot work. How to do this in pandas? Here is the column:</p>
  
  <p><a href="https://i.stack.imgur.com/GOTJJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GOTJJ.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/Ihetf.png" rel="nofollow noreferrer">enter image description here</a></p>