Here is my output. I want to remove all the rows when the market is closed, whatever the date.
So delete all rows from 21:00:00 to 14:30:00 (GMT) for every day.

```
                          Open       High        Low      Close     Volume
Datetime                                                                  
2020-02-24 14:30:00  48.174999  48.200001  47.500000  47.770000  7004859.0
2020-02-24 14:31:00  47.830101  48.490002  47.689999  48.380402  1237115.0
2020-02-24 14:32:00  48.360100  48.630001  48.119999  48.610001   792655.0
2020-02-24 14:33:00  48.610001  48.660000  48.395000  48.619999   675367.0
2020-02-24 14:34:00  48.570000  48.570000  48.570000  48.570000   725846.0
...                        ...        ...        ...        ...        ...
2020-02-28 16:37:00  45.044998  45.389999  45.044998  45.369999   442847.0
2020-02-28 16:38:00  45.349998  45.410000  45.290001  45.400002   361566.0
2020-02-28 16:39:00  45.409302  45.540001  45.380001  45.500000   393467.0
2020-02-28 16:40:00  45.500000  45.509998  45.360001  45.420300   414059.0
2020-02-28 16:41:35  45.660000  45.660000  45.660000  45.660000        0.0

[1685 rows x 5 columns]

```