Sorry I know it has been covered but nothing works for me.
Maybe it's my formating.

Cell A1=10am (format is '*1:30:55 PM' from the Format Cells dialogue box -
Time/Type)
Cell B1=5:30pm (format is '*1:30:55 PM' from the Format Cells dialogue box -
Time/Type)

No matter what I do eg '=B1-A1' or many other formulae I still get #VALUE
error.

I want to know in number format the number of hours elapsed.
Will NOT be greater than 24.
--
Regards
Tom