dfr get-ordinal for dataframe

Gets ordinal from date.

Signature

> dfr get-ordinal

Input/output types:

input	output
any	any

Examples

Returns ordinal 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-ordinal
╭───┬─────╮
│ # │  0  │
├───┼─────┤
│ 0 │ 217 │
│ 1 │ 217 │
╰───┴─────╯

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