Calculating number of people working per hour

[ptrifile]

I am attempting to make a formula to calculate the total number of people scheduled per hour based on their start and end times. It seems to work fine until there is a shift that crosses over midnight. I have attached a quick sample of what i am seeing with my formulas and wondering if someone can help me get the correct calculations.

Thank you in advance for any help anyone can offer.

Paul

 

[SkipVought]

hi,

1. Your TIME value in G6 is 1/1/1900 7:00:00 AM and correctly so! Every TIME value in this list ought to have a DATE component in order to accommodate the midnight shift to the next day.

2. So the value in G7 and following needs to be
[tt]
G7: =G6+TIME(1,0,0)
[/tt]
...and COPY N PASTE down.

3. The COUNTIFS formula then is (using named ranges)
[tt]
H6: =COUNTIFS(shift_Start,"<="&G6-INT(G6),Shift_End,">="&G6-INT(G6))
[/tt]

BTW, I greatly prefer using SUMPRODUCT()
[tt]
H6: =SUMPRODUCT((shift_Start<=G6-INT(G6))*(Shift_End>=G6-INT(G6)))
[/tt]




Skip,
[sub]
Just traded in my OLD subtlety...
for a NUance![/sub]
"The most incomprehensible thing about the universe is that it is comprehensible" A. Einstein

 

[SkipVought]

I saw yet another issue where the Shift End crosses the day.

So I added another column, Shift End1 with the following formula...
[tt]
E6: =IF(C6>D6,1,0)+D6
[/tt]

This will only work under this restriction: That ALL Shift Start times are for the same day, from midnight (12:00 AM to 11:59 PM)

Then...
[tt]
H6: =SUMPRODUCT((shift_Start<=G6-INT(G6))*(Shift_End[highlight #FCE94F]1[/highlight]>=G6-INT(G6)))
[/tt]
And the other thing I did was use Excel's Series feature by entering [highlight #FCE94F]7:[/highlight] and [highlight #FCE94F]8:[/highlight] in G6 & G7 respectively and then SELECTING G6 & G7 and DRAGGING the handle down thru G29. This will auto increment each cell and add a date value at midnight.

File attached.

Skip,
[sub]
Just traded in my OLD subtlety...
for a NUance![/sub]
"The most incomprehensible thing about the universe is that it is comprehensible" A. Einstein

 

[ptrifile]

Thanks Skip, I just got back around to trying to figure this out again.....if you look at the file you sent back to me I think there is still an issue. Lets focus just on the 1:00 am time slot.....It shows 2 people working when it should be 9 people working at 1 am. Am I looking at something incorrectly?

Really appreciate your help here!

Thank you!

Paul

 

[SkipVought]

I had two different things going in my head. Since Shift_End1 accounts for the times in the next day, there’s no need to remove thenext day date via INT().

This one should work better. I count 7 by hand and via formula.

H6: =SUMPRODUCT((shift_Start<=G6)*(Shift_End1>=G6))

Skip,
[sub]
Just traded in my OLD subtlety...
for a NUance![/sub]
"The most incomprehensible thing about the universe is that it is comprehensible" A. Einstein