Function formatTimeSpan

formatTimeSpan(
    relativeTimeFormatter: RelativeTimeFormat,
    since: Date,
    to?: Date,
): string
Get a localized string representation of the time between two dates
Parameters
- relativeTimeFormatter: RelativeTimeFormat
- since: Date
  "Destination" time. time against which to get the time span.
- to: Date = ...
  "Starting" time. Time span will be formatted relative to to. Defaults to new Date()
Returns string
Time span in words from to to since
Example
```
`since` = 3 Aug 2024 8:00 AM

`to` = 5 Aug 2024 8:000 AM

Returns: "two days ago"
```
- Defined in lib/platform-bible-utils/src/date-time-format-util.ts:21