Add any number of days, months or years to a date with this simple trick

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Let’s say you have a date in A1 and want to find out future date after 2 years, 4 months and 9 days.

Here are a few formulas you can try.

  1. =A1 + DATE(2,4,9)
  2. =EDATE(A1, 2*12+4) + 9
  3. =A1 + 2*365 + 4*30 + 9

Surprisingly, each formula gives a different result! So which one should you use?

date-add-mystery

Let’s test them with a sample date to see the results.

Assuming A1 has today’s date, ie 2nd of August, 2016, we get below results respectively.

  1. 10-NOV-2018
  2. 11-DEC-2018
  3. 9-DEC-2018

But which one is the correct answer?

We can use manual calculation to find the correct answer.

Today is 2nd of August 2016, so:

  • Adding 2 years to it, we get 2nd of August 2018
  • Adding 4 months, we get 2nd of December 2018
  • Adding 9 days, we get 11th of December 2018

That means, the correct formula would be =EDATE(A1, 2*12 + 4) + 9

Which one would you use?

My preference is to use EDATE() when doing any date arithmetic that involves months or years. For adding either days, I use simple date + number method. For adding workdays, I use either WORKDAY() or WORKDAY.INTL() formulas.

What about you? What formula would you use to add any number of years, months and days to a give date? Please share your formulas in the comment section.

More dating advice for you

If you and Excel are always on a bad date, you could use some advice. Check out below tutorials to have an amazing dating scene.

This post is part of our Awesome August Excel Festival.

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9 Responses to “Show forecast values in a different color with this simple trick [charting]”

  1. Jake says:

    While this works in a pinch, it clearly "lightens" the colors of the entire chart. Depending on where you use this, it will be blatantly obvious that you don't know what you are doing and present a poor looking graph.

    Why not separate the data into different segments when charting and have as many colors as you have data points? You might have to create a new legend and/or repeat the chart in "invisible ink", but it would be cleaner and more consistent when new or updated data becomes available.

    • Andy F says:

      While I think I agree that doing it "properly" via a second series is preferable, I don't necessarily agree that making the entirety of the "future" (data, gridlines, and even the axis) semi-transparent is "poor looking". I think it could be seen as adding more emphasis to the "future-ness" of the forecast data.

      In short, it's another tool for the toolbox, even if it's never needed.

  2. Kiev says:

    Quick & effective, cool. thanks.

  3. dan l says:

    I always use the dummy series.

  4. Peter Stratton says:

    Nice little trick, thanks very much!

  5. excel says:

    Two sets of data better. Control is much better.
    You can use the same chart next month to see what is actual and what is forecast.

    To use this trick, I think grid lines has to be removed, that will make the graphic much more sharp.

  6. gossip_boi says:

    to be honest, i dont understand why there is needed to do this way... in this case horizontal lines will be pale as well. then why a just can't change the color of the line partly???

  7. Great tutorial. Thanks for the tutorial!

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