If you select the "Fill Series" radio button, Excel fills the cells with dates that increment by one day, starting from the date you typed.

If you intend to obtain a list of all dates or data between two given dates in Excel, then you can Use the Fill handle or use a Formula. Learn how.

How to return a sequence of dates in Excel Excel’s fill handle can generate a quick list of dates for you, but the list is static; you must create a new list if your needs change.

One Excel feature that will save you time is Autofill, which can generate a series of dates for your worksheets.

How to Disable Date Auto Fill in Excel. Microsoft Excel's Auto Fill features help you quickly enter the same value in more than one cell or fill a series of cells with related or sequential values.