To add 10 hours make sure that you enter the data as 10:00:00 eg Cell A1 contains 15/10/02 05:30:00 and cell B1 contains 10:00:00 and finally cell C1 contains =A1+B1 the result will be 15/10/02 15:30:00
If you add 10 to your current value you will add 10 days, as Excel stores dates and times as parts of a day. If you want to add 10 hours to a time/date,
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