dfr get-weekday for dataframe

Gets weekday from date.

Signature

> dfr get-weekday

Input/output types:

input	output
any	any

Examples

Returns weekday from a date

> let dt = ('2020-08-04T16:39:18+00:00' | into datetime -z 'UTC');
    let df = ([$dt $dt] | dfr into-df);
    $df | dfr get-weekday
╭───┬───╮
│ # │ 0 │
├───┼───┤
│ 0 │ 2 │
│ 1 │ 2 │
╰───┴───╯

Tips: Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe flag