Calculating Data Within Past 24 Hour Time Period

Jun 7, 2014

I am a flight instructor and legally we cannot work more than 8 hours in any consecutive 24 hour period. I'm trying to create a spreadsheet that will calculate the totals from that 24 hour period for me.

Right now I have something that sort of works, but not the way I would like it. I have a column for "time" that has the date and ending time of the flight and I am using that as if the total flight occurred at one moment (the ending time).

So, for instance let's say I did these flights

1: 8AM-10AM (2 hours, clocked at 10AM)
2: 11AM - 2 PM (2 hours, clocked at 2PM)
3: 7AM-9AM the following day (2 hours, clocked at 9AM)

If I have my formula calculate the time for 9AM the following day (totaling the past 24 hours) the first flight won't be included in the calculation since the hours from that flight is only imputed at 10AM. The formula would read 4 hours rather than the (actual) 5 hours.

Here is my workbook : 8 hour calculator sample.xlsx

Here are the formulas I am using

The time is formulated at date and time, with time being the ending flight time

The start time for the calculation is

[Code]....

end time is just =NOW()

Total calculation is

[Code] .....

All I'm trying to do is use the totals under "flight start" and "flight end" instead of the end flight time I had to put in under the date column.

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