Calculating Elapsed time over multiple days

Hello Community!
I am creating a logbook for our aircraft and attempting to correctly use the DUR2HOURS function to calculate flight times. DUR2HOURS does a great job of converting take off and landing times into decimal format but runs in to trouble when take off is late on one day and landing is on the next day. For example: Takeoff at 21:00 and landing at 01:00 gives a large negative number. I am using the very basic formula =DUR2HOURS([ldg time]-[takeofftime]) I realize that my equation will not work when we land on the next day. How can I modify my formula to correctly calculate a duration over multiple days? Thanks in advance for your help!

if you enter the complete date and time then this should still work:
format the depart and arrival times:
You can then sum the durations as:
C13=SUM(C)
Rows 1 is a header and row 13 is a footer

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I am fully aware of many topics discussed in the various forums here related to the OS timezone and DST settings impacting how the JVM will process date/time calculations. I am running on Windows XP Professional, and I have checked and double checked the timezone setting, it is correctly set to Central Time and the "Automatically adjust clock for daylight saving changes" checkbox is checked.
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* TestTimeZone.java
* Created on September 12, 2004, 7:18 PM
import java.io.*;
import java.util.*;
import java.awt.event.*;
import java.sql.*;
import java.text.*;
* @author Jared
public class TestTimeZone {
    java.util.Date startDt;
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     * @param args the command line arguments
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Elapsed: 23:00:01 Start: 00:03:57 Current: 00:03:58
Elapsed: 23:00:02 Start: 00:03:57 Current: 00:03:59
Elapsed: 23:00:03 Start: 00:03:57 Current: 00:04:00
Elapsed: 23:00:04 Start: 00:03:57 Current: 00:04:01
Elapsed: 23:00:05 Start: 00:03:57 Current: 00:04:02
"

Great. Now that we have gotten half way to the goal, please let me know how you intend to get that difference in miliseconds presented as a time value using any of the date/time classes Java has to offer. That way, I don't have to rewrite the code that puts it into a properly formatted String (the kind folks at Sun have already written that code). Using date/time classes to acheive this is what I attempted with my application. I added the milisecond adjustments for TZ and DST because if I didn't the reported elapsed time would be off by 6 hours, not just 1.
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Edited by: user12301147 on Dec 2, 2009 9:16 AM

Hi,
It looks like to have to adjust for time zones.
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Hi All -
My scenario is as follows:
I have a semi FG C going into multiple FGs A and B.
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Hi
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Yes, I thought about that. But if you start at say
9pm and end at 2am you would get the incorrect result
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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.
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B

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Calculating Elapsed time over multiple days

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