title: Python Pandas Combined Date and Hour Into One Column and plot using lineplot
body: <p>I have my data as below. I need to combine this date and hour into a single column and I need to plot a line plot for year 2015 and its corresponding hours.
  <a href="https://i.stack.imgur.com/bdlM0.png" rel="nofollow noreferrer">enter image description here</a></p>