dfr get-day for dataframe> dfr get-day {flags} 
| input | output | 
|---|---|
| any | any | 
Returns day from a date
>letdt= ('2020-08-04T16:39:18+00:00'|into datetime-z'UTC');
letdf= ([$dt$dt] |dfr into-df);
$df|dfr get-day
╭───┬───╮
│# │ 0 │
├───┼───┤
│0│4│
│1│4│
╰───┴───╯
Tips: Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe flag
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    https://www.nushell.sh/commands/docs/dfr_get-day.html