Hello Experts,
Can someone please put me out of my misery - at the moment I am unable to
see the forest for the trees?

My ultimate aim is to get formula 1b & 2b to work together so that I get to
text results, at the moment I can only get the combinations of 1a & 2b or 1b
& 2a, which give one of each of text & date serial number. (I had it working
once a couple of days ago, but forgot to save the file & now I've gone
completely blank.)

(1a) =IF(AM3=0,"",VLOOKUP(AM3,Break_Dates,2,FALSE))
(1b) =TEXT(IF(AM3=0,"",VLOOKUP(AM3,Break_Dates,2,FALSE) ),"ddmmyy")
and
(2a) =IF(AM30,AX3+AM3-1,AX3)
(2b) =IF(AM30,TEXT(AX3+AM3-1,"ddmmyy"),TEXT(AX3,"ddmmyy"))

I've also given myself another one whereby I need to subtract hours from one
another and result in a number format.
Eg: 17:00 (5PM) minus 15:00 (3PM) = 0.83333334
What I want is for it to give me =2 (as in 2hrs).

I can hear the men with long-armed white jackets approaching - HELP!