How to deduct time in excel

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# How to deduct time in excel

In Excel dates are whole numbers and times are fractions after that.

For example, today is 39533 so at noon (12:00 PM) would be 39533.5.

There are a couple of ways to subtract 30 minutes but one of the simplest is to convert it to a fraction of a day.

Just take your number and subtract the result of 30/24*60 (or 1440). 30/1440 = 0.020833...

You can also use the TIME function (= Your Original Time - TIME(0,30,0)) but if you notice when you enter the values in the TIME function it is doing the exact maths I mentioned earlier. 30 minutes is 0.020833... days.

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