formula that can be used in Google spreadsheets to formulate the date, but as in the arithmetic sequence, it has a difference of two

is it possible that if is the answer given in the formula int will automatically calculate the date, but the date will increase in two.

example: the start date is dec. 22,2018 and the end is January. 5.2019 ay divide these two dates into two that result in 7, so if the date starts in 22.2018 dec, the next will be dec. 24,2018, and add again to the days until it reaches the end date which is jan. 5.2019.