Calculating task time

Hi all,
I am new at this forum so I hop this is the correct place to ask this question.
For a project, I have 2 deadlines (A and B). In between these 2 deadlines there are 3 tasks that take place (X, Y and Z). I want MS Project to calculate the time for tasks X, Y and Z based on the total time between A and B. In this example, X is 50% of the
time, Y 30% and Z 20%. When the time between A and B equals 20 days, X should take 10 days, Y 6 days and Z 4 days.
My question: Is is possible for MS Project 2010 to use some formula to calculate the duration times of tasks X, Y and Z?
Thank you for helping me!
Cheers, Koen

Hi Koen,
Unfortunately the duration cannot be calculated by a formula. You eventually have duration custom fields but anyway formulas can only refer to the row they are attached to, not to another row. Either you do some custom VBA code, or you set the duration manually.
Hope this helps,
Guillaume Rouyre, MBA, MVP, P-Seller |

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Sam,
OT = MAX(totaltime - 8hours, 0)
With that expression, Overtime will never go negative.
Jerry

Calculating total time.

I'm somewhat new to using spreadsheets. Basically I just want to keep track of the time I spend doing a particular job. So I'm tracking my start time, end time, and then I want to calculate the total time spent. Thanks.

Yes, I thought about that. But if you start at say
9pm and end at 2am you would get the incorrect result
of 7 hours. I think I have to convert the time to
something else before the math takes place. But I'm
not sure how that would work.
I'm not sure how you managed to subtract 9pm from 2pm and get 7 hours. When I try 2am - 9pm, I get #VALUE!, as AppleWorks reads both 'times' as text, and cannot use Text values in a formula that requires numbers. AppleWorks is a bit fussy on what it considers to be a number.
Using the default alignment, you can recognize what AppleWorks thinks is a number—it will be aligned to the right of the cell—and what AW considers to be Text—it will be aligned to the left of the cell. In the case of Time, you're better off using the 24 hour clock, and entering one minute betore 2pm as 13:59.
The Mac clock's unit of time is the (24 hour) Day, and all times entered are regarded as the portion of one day that has elapsed up to that time. When you do the subtraction, the result is also a time of day. For start and end times within the same calendar day, simply doing the subtraction will give a result that can be read as the (correct) elapsed time. For the example times you gave, the 'correct' result is also visible:
02:00 - 21:00 = 05:00
But the actual numbers behind that 05:00 result and the two times used to get it are the portion of the current day that has passed up to each of the times entered, and the difference obtained when you do the subtraction:
0.0833 - 0.8750 = -0.7917
If you only want the (readable) result for a single day, that's not a problem. But if you want to add the results to get a total time for a week, you need to (make AppleWorks) do some additional math. In simplest terms, you need to add 1 to the end time if the end time is on the calendar day after the start time. There's an explanation of this below, which you should read for a better understanding of Time and the Mac, but which isn't necessary to use the formula.
The formula assumes your start time is in column B, your end time in column C, your formula reporting time worked is in column D, and that you will enter times in rows 2..6, and calculate the week's sum in D7
Enter in D2, and fill down to D6: =IF(C2,C2-B2+(C2<B2),"")
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Enter in D7: =24(SUM(D2..D6)) —to report the result in hours (eg. 25.678)
Format the cell to display as Number, General.
or
Enter in D7: =INT(24(SUM(D2..D6))&":"MINUTE(SUM(D2..D6)) —to report the result as hours and minutes
Note that the second option for D7 produces a text string which will not be useable in further calculations.
This is Text, so no Number formatting is necessary.
Regards,
Barry
Time and the Mac
The Mac clock tracks time in Days and Fractions of a Day, starting at midnight, January 1, 1904.
Nine PM today, May 8, 2006, represented as a decimal number, is 37383.875. Two AM tomorrow, May 9, 2006, is 37384.0833333333.
An AppleWorks spreadsheet cell (or database field) formatted to display as Time will ignore the whole number part of those numbers, and interpret the decimal fraction part as Time of Day, and display the result in the Time format you have chosen for the cell.
A cell (or field) formatted to display as a Date will ignore the fractional part of the number, and display the whole number part in the Date format you have chosen.
When you enter a time, the result is the time of day on January 1, 1904. When calculating elapsed times where start and end times cross the midnight boundary, you need to add 1 (day) to the result to compensate for the change in day and get a result that can be used in further calculations. That's what the "+(C2<B2)" part of the first formula above does—adds 1 if "(C2<B2)" is TRUE or adds 0 it it's false.
If you add times, the result is 'correct', but if the total reaches 24 hours, the displayed result will appear incorrect as a Time formatted cell ignores the whole number part of the actual result (eg. 27 hours, or 1.25 days), will display as 03:00, the same as 3 hours, or 0.25 days. You can convert the result to hours and fractions of hours by simply multiplying the result by 24, and displaying it as a Number rather than as Time.
B

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Michael Bluejay wrote:
I need to do various calculations on time, such as:
(1) Marathon finish time is 3:39:00 (h:mm:ss). Divide by 26.2 to get the pace (minutes per mile).
(2) I run 0.935 miles in 6:57 (m:ss). Divide 6:57/0.935 to get the pace.
These were dead-simple in AppleWorks. My formulas were simply =A1/26.2 and =A2/0.935 >respectively. But I'm having a sinking feeling that I can't do it in Numbers, at least not easily.
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3:39/26.2 = 0:08:21.527 (colon format)
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Calculating task time

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