How to Calculate Time Between Two Dates with constraints taken into account (working hours)?

I'm trying to calculate the time between two dates BUT also whilst taking into account a working hour constraint. I am trying to do this using Excel formulas.

Example follows below, where the working hour constraint would be between 08:00 -> 18:00. I.e only time which follows during these hours should be taken into account.

+---------------+-------------+----------------------+----------------------+
|     Start     |     End     |  Total Difference    | Within Working Hours |
+---------------+-------------+----------------------+----------------------+
| 1/1/19 20:20  | 1/2/19 9:30 | 13 hours, 10 minutes | 1 hour, 30 minutes   |
+---------------+-------------+----------------------+----------------------+

The question is how do I calculate the Within Working Hours column?

Thanks!