Flight log time calulation when time passes to the next day.

I am converting an excel spreadsheet to numbers for use on my iPad. I have a flight log that records various flight information. One of the calculations is flight time. Currently, using excel, I am able to put a start time in a cell, let's say c6, with a value of 19:09. The next cell over, let's say, d6 has the ending time with a value of 01:03. Therefore, the flight time calculated should be 5hrs 54 min, or 5.9 hours. I would need numbers to calculate the total flight time. Note that the date has changed, the flight departed at 19:09 and landed after midnight, herein lies the problem. If the flight departs and lands the same day I have no issues, however, when the flight lands the next day the formula is incorrect. If it's any help here is the excel formula I use;
=IF(H6>0,(IF(H6>0,(IF(H6<I6,-(((H6-INT(H6))24)-((I6-INT(I6))*24)),((((I6-H6)*1)24)+24))),)),"-")
Any help would be greatly appreciated. Anyone in the Phoenix area may get a free flight if you provide a great deal of assistance.
Thanks Ryan

Assuming that Date and Time values are handled the same way in Numbers for iPad as in Numbers '09,
You need to include the Date information for times of days other than the day they are entered.
Any cell displaying either Time or Date information actually contains a Date and Time value. If you entered only the Time portion of that value, the Date portion is automatically set to Today's Date.
If you enter only the Date portion of the value, the Time portion is automatically set to 00:00:00 (midnight).
So for a flight starting today (July 29) at 19:09, and ending tomorrow (July 30) at 01:03, Numbers will return a negative result if no date is specified for the landing time (unless that time is entered tomorrow, of course).
Solution 1:
Format C6 and D6 to show Time and Date, and enter both where the date involved is not the date the information is entered.
Solution 2:
If all details are entered on the same day AND no flight lasts more than 23h 59m, the following formula will correct for ending times 'earlier' than starting times:
=IF(D6>C6,D6-C6,D6+1-C6)
Regards,
Barry

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