I have a formula that is to reslut in counting the number of incidences if
the line meets the criteria.
1. Jan (Month)
2. Sun (Day of the Month)
3. 11 (Hour of the Day)
4. The fourth criteria column just has a 1 in it to count.
If the line meets all 3 criteria count it otherwise put a zero in the cell.

Sum(IF($B$5:$B$5034="Jan",IF($H$5:$H$5034-"Sun",
IF($J$5:$J$5034=11,$I$5:$I$5034,0),0)))

This formula works for me with the "Jan" and the 11, but when I add the
third criteria "Sun" it gives me a zero.

Hope someone can help.
Thanks