# `OpenHours.Duration`
[🔗](https://github.com/hopsor/open_hours/blob/v1.0.1/lib/open_hours/duration.ex#L1)

This module contains functions to calculate business time duration.

# `between`

```elixir
@spec between(OpenHours.Schedule.t(), DateTime.t(), DateTime.t()) :: non_neg_integer()
```

Calculates the business time elapsed between two DateTimes, in seconds.

Only time that falls within business hours (as defined by the schedule) is counted.
Non-working hours, weekends, holidays, and breaks are excluded.

## Examples

    iex> schedule = %OpenHours.Schedule{
    ...>   hours: %{
    ...>     mon: [{~T[09:00:00], ~T[17:00:00]}],
    ...>     tue: [{~T[09:00:00], ~T[17:00:00]}]
    ...>   },
    ...>   time_zone: "Etc/UTC"
    ...> }
    iex> starts_at = DateTime.from_naive!(~N[2026-03-16 10:00:00], "Etc/UTC")
    iex> ends_at = DateTime.from_naive!(~N[2026-03-16 15:00:00], "Etc/UTC")
    iex> OpenHours.Duration.between(schedule, starts_at, ends_at)
    18000

---

*Consult [api-reference.md](api-reference.md) for complete listing*