code: def cols_to_dt(df, col_list,set_format = None,infer_format = True,dest = False):
      
      if not dest:
          return _pd.DataFrame({col_name:col_to_dt(df,col_name,set_format,infer_format) for col_name in col_list})
      for col_name in col_list:
          col_to_dt(df,col_name,set_format,infer_format,dest)
docs: Coerces a list of columns to datetime
      Parameters:
      df - DataFrame
          DataFrame to operate on
      col_list - list of strings
          names of columns to coerce
      dest - bool, default False
          Whether to apply the result to the DataFrame or return it.
          True is apply, False is return.