title: How to merge date and time into one datetime column
body: <p>I have a recently made data.frame that has three columns, Date, Time, and Data. I'm looking to combine the date and the time variables into one Date.Time variable.</p>
  
  <p>My data.frame is called, <code>data_dataframe</code> and looks like this:</p>
  
  <pre><code>Date     Time   Data
  1/26/94  13:00  8.4
  </code></pre>
  
  <p>I tried:</p>
  
  <pre><code>as.POSIXct(paste(data_dataframe$Date, data_dataframe$Time), format="%d/%m/%Y %H:%M:%S")
  </code></pre>
  
  <p>but this didn't work. Reading around didn't seem to help my problem. Any tips?</p>