In Numbers, I would like to create a column with automatically generated cells to create a timetable with each hour and each half hour.

I create a new document, type in "7:30 AM" and then in the cell below I type in "8:00 AM" then I drag downwards from the first cell, but it doesn't work, it replaces "8:00 AM" by "8:30 AM" but I only want 30 mns increments...

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I tried changing the cell format to "date and time" but it just erases whatever I typed and replaces it by today's date and time or random dates and times...

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2 Answers 2


In addition to njboot's answer, If you wish to drag and apply the ½ hour increments without entering a formula, be sure to select Both cells before dragging down the yellow dot. This will copy the pattern down (or across, for that matter.)


If you want to use a formula:

Use Duration:

DURATION(weeks, days, hours, minutes, seconds, milliseconds)

Using Duration one can then adjust the increments later on affecting all cells with one simple change. For example, suppose you wish to change it to 15 minute increments or 2 hour or 25 minutes. This can be accomplished using a dynamic formula to allow for greater flexibility in your solution.

One could add a new table (or use hidden cells or whatever tickles one's fancy) to create an area where a number can be added that will change the increments universally.

Create Duration formula:

Duration Formula

Notice that Hours and Minutes are tied to cells that can be adjusted without changing the formula.

Formula to increment time

Then, after dragging down the formula, just change the increments when desired.

30 minute 15 minute


The formula syntax in Numbers is actually less intuitive and more stubborn than Excel IMO. Nevertheless, to create time intervals:

  1. In the first cell, say B2, type 8:00 AM

  2. In the following cell, type =B2+"30m"

  3. Now, drag down:

  4. Voilà:

  • Awesome! But I think you mean "Voilà" :) Sep 4, 2015 at 8:55
  • @fabriced Sì! colpa mia :)
    – njboot
    Sep 4, 2015 at 9:12

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