How to generate series of dates

To generate a series of dates, do the following:

   1.    Enter the first date.

   2.    Drag the cell's fill handle while pressing the right mouse button (right-drag the cell's fill handle).

   3.    Release the mouse button and select an option from the shortcut menu:

Choose Series... to open the Series dialog box:

For example, if the Step value is 3, and in the Date unit section, the Month option is selected:

See also this tip in French: Comment créer une série de dates.