## Expand description

Conversion between units of time.

## Structsยง

- A unit of time representing exactly one day.
- A unit of time representing exactly one hour.
- A unit of time representing exactly one microsecond.
- A unit of time representing exactly one millisecond.
- A unit of time representing exactly one minute.
- A unit of time representing exactly one nanosecond.
- A unit of time representing exactly one second.
- A unit of time representing exactly one week.