separate datetime column in R while keeping time accurate

4/12/2016 12:00:00 AM I have dates in the format above and have tried to use separate() to create two columns in the data frame where the data is present. When I do the columns are created but AM/PM so the times just become numbers or worse appear as "12H 0M 0S". Can anyone help me out, pretty new to data analysis as a whole and would be much appreciated!

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