Adding times on different worksheets in same file

[MBC]

I am trying to work out the "shift Gap"(Rest time) between two shifts which
are on different worksheets in the same file. Worksheet 17 cell ref AB3
contains my finish
time of 17:00 and worksheet 18 cell ref I10 contains my shift start time of
8:00. The answer is 15 but the formula I am using gives me an answer of 17?.
Can't see where I am going wrong.
=IF('Week 17'!AB3=0,24,IF('Week 17'!AB3>I3,('Week
17'!AB3-I3)*24,24-(I3-'Week 17'!AB3)*24))

 

[Bob Phillips]

I get 9, but try

=IF('Week 17'!AB3=0,1,MOD(I3-'Week 17'!AB3,1))*24

 

[MBC]

Thanks Bob that worked however where my start time cell ref I10 is empty it
returns 7 as the answer. Is there any way I can get it to return 24?

 

[Bob Phillips]

Where does I10 come into it? AB3 is the start cell and if that is zero it
returns 24.

 

[MBC]

Sorry Bob I should have said I3.Even then I still get a result of 7 if I3 is
left empty and ideally I would like it to read 24.

 

[MBC]

It would be I3 which would be empty as this would signify a "rest period".

 

[Bob Phillips]

=IF(OR('Week 17'!AB3=0,'Week 18'!I3=0),1,MOD(I3-'Week 17'!AB3,1))*24

 

[MBC]

Thanks Bob, this worked. Much appreciated

I get 9, but try

=IF('Week 17'!AB3=0,1,MOD(I3-'Week 17'!AB3,1))*24

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__________________________________
HTH

Bob