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Excel/Countifs with time values


Hi Nathan

On Sheet 1, I have a table with 3 columns, 'start', 'finish', 'room'.  Start and Finish are formatted as time eg.  8:00:00 AM

On Sheet 2, I have times in 10 min increments (formatted to time as above) in column A.  I want to count the number of times a room is used between the time eg 8.10am and 8.20am.  

My formula which is not working - reads =Countifs(Sheet1!$c$2:$c$1000, "=Room1", Sheet1!$a$2:$a$1000, ">="&$a2, Sheet1!$c$2:$c$1000, "<"&$a3)

Am I using the correct formula type?


You are very close.  Here are some initial comments:

1) You don't need the = sign before Room1.  It can just be "Room1"
2) Your third element is looking at column C for the end date... it should be looking at column B.

Once you make those changes the formula will work; however, it only works if the start and end time fall within exactly a 10 minute increment.  In other words, if the time the room is in use is from 9:05 AM to 9:15 AM then it will show zero.  I anticipate you would actually prefer to show it in use during both applicable 10 minute periods.  As such, if that is the case, you would want to use this formula:

=COUNTIFS(Sheet1!$C$2:$C$1000,"Room1", Sheet1!$A$2:$A$1000,"<="&$B2, Sheet1!$B$2:$B$1000,">"&$A2)

All I did was switch criteria around a little to get the proper selection.

I have uploaded my example here:

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