Extract timestamp from get_bars

how do I extract the timestamp to a list from the output of get_bars?

                         open    high  ...  trade_count        vwap

timestamp …
2022-08-11 06:36:00+00:00 169.49 169.49 … 8 169.477950
2022-08-11 08:00:00+00:00 169.00 169.33 … 136 169.133025
2022-08-11 08:02:00+00:00 169.27 169.27 … 29 169.256655
2022-08-11 08:03:00+00:00 169.29 169.29 … 23 169.274014
2022-08-11 08:04:00+00:00 169.20 169.30 … 59 169.253096
… … … … … …
2022-08-12 23:55:00+00:00 171.89 171.89 … 7 171.889828
2022-08-12 23:56:00+00:00 171.89 171.89 … 18 171.889023
2022-08-12 23:57:00+00:00 171.88 171.88 … 20 171.876099
2022-08-12 23:58:00+00:00 171.88 171.90 … 35 171.869884
2022-08-12 23:59:00+00:00 171.85 171.90 … 42 171.876487