1. What is the field type for
HSVCCLASSSUMMARY.INTERVALSTART?
2. What are a few sample pieces of data?
3. Which of the 3 above options did you try?
Here is a process to test the formula...
pull all the rows intot he report.
add a fomula field as:
timevalue({HSVCCLASSSUMMARY.INTERVALSTART}) in timevalue(#07:00:00#) to timevalue(#21:00:00#)
Place it on the detail row. It should show a True value when the time is between 7 am and 9 pm and FALSE any other time.
Did it do that? If not what did it do?