Struggling with a Time Formula

[EDMONDO66]

I am currently doing a spreadsheet which has Expected arrival time in column A and Actual Arrival time in column B

So A1 will have 10:00 and in B1 has 07:50....easy peasy however the formula I used for that doesn't work in the next row: -

A2 has 23:00 & B2 has 01:00

Now whatever formula I use I cannot get the correct answer in both rows.

I have tried multiple formulas to make it all work and it doesn't

I am trying to have a 1 size fits all rows regardless if the times are the same day or rolls past midnight.

I have looked at the formats to see if that was the issue.

What formula will fit all scenarios?

Really doing my head in and spoiling my Excel reputation at work

Cheers peeps in anticipation