# Description
Add `format duration` cmd to choose output unit.
This takes the previous `into duration --convert ...` behavior which
returned a string into its own `format duration` command.
This was suprising and not fitting with the general type signature for
the `into ...` commands.
This command for now lives in the `nu-cmd-extra` nursery.
# User-Facing Changes
## Breaking change
Removes formatting behavior from `into duration`
Now use `format duration` instead of `into duration --convert`
## Usage:
```
1sec | format duration us # Output data in microseconds
"2ms" | into duration | format duration sec # go from string to string
```
# Tests + Formatting
Basic example testing (including basic broadcast)
f91713b714