docs: def col_to_dt(df,col_name,set_format = None,infer_format = True, dest = False):
      """ Coerces a column in a DataFrame to datetime
      Parameters:
      df - DataFrame
          DataFrame to operate on
      col_name - string
          Name of column to coerce
      dest - bool, default False
          Whether to apply the result to the DataFrame or return it.
          True is apply, False is return.
      """
      new_col = _pd.to_datetime(df[col_name],errors = 'coerce',
                                      format = set_format,infer_datetime_format = infer_format)
      if dest:
          set_col(df,col_name,new_col)
      else:
          return new_col