Series of dates by month

Series of dates by month


If you need to generate a dynamic series of dates with a formula that increase by one month from a single start date, you can do so with a formula that uses the DAY, MONTH, YEAR, and DATE functions.

How the formula works

In the example, B6 is the hard-coded start date and the formula in B7 is:


To solve this formula, Excel first extracts the year, month, and day values from the date in B6, then adds 1 to the month value. Next, a new date is reassembled by the DATE function, using the same day and year, and month + 1 for month.

=DATE(YEAR(B6),MONTH(B6)+1,DAY(B6)) =DATE(2018,9+1,28) =DATE(2018,10,28) =10/28/2018

The first formula therefore returns a new date of 10/28/2018, one month later than the starting date.

Once the first formula is entered, it is copied down as far as needed. Each subsequent formula creates a new date incremented by one day.

Note: if you start with a date like January 31, the formula above will skip February and move on to March. This happens because the new date, 2/31/2018 doesn’t exist, so Excel uses the day value to roll forward to 3/3/2018, 3 days after the last day in February.

If you need a series of dates where every date is the last day of the month you can use EODATE like this:


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