The format will be in the Type list the next time you need it. Take note of the colon after and a semicolon after mm. In the Type box, at the top of the list of formats, type and then choose OK. In the Format Cells box, choose Custom in the Category list. On the Home tab, in the Cells group, choose Format, and then choose Format Cells. To display the time as more than 24 hours, select cell B4. This is because the time for Task 2 is in 24-hour time. The result is 4:15, which is not what you might expect. Type =B2+B3 in cell B4, and then press Enter. In cell B2 type 12:45, and in cell B3 type 15:30.
You need to apply a special format to the formula result. Well, that was easy enough, but there’s an extra step if your hours add up to more than 24. Press Enter to get the same result, 16 hours and 15 minutes. The formula will look like this: =SUM(B2:B3). Select cell B4, and then on the Home tab, choose AutoSum.
Here's a good link on Khan Academy that explains more about modulo.Tip: You can also add up times by using the AutoSum function to sum numbers. (In this way, the MOD function works a bit like a clock. The MOD function takes care of the negative problem by "flipping" negative values to the required positive value. For example, to calculate hours between 9 PM and 3 AM: =MOD(0.125-0.875,1)*24
One elegant way to handle this challenge is to add the MOD function to the formula. When times cross midnight, the problem becomes more tricky, since the end time will often be less than the start time. For example, with start time of 9:00 AM and an end time of 3:00 PM, you can simply use this formula: =(3:00 PM-9:00 AM)*24 To calculate hours between times, you can simply subtract the start time from the end time when both times are in the same day. To convert these fractional values to decimal hours, just multiply by 24. In other words, Excel times are just fractional numbers: Time Excel dates are serial numbers, and a day is equivalent to the number 1.
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